1285956 has 81 divisors (see below), whose sum is σ = 3926559. Its totient is φ = 367416.
The previous prime is 1285943. The next prime is 1285969. The reversal of 1285956 is 6595821.
It is a happy number.
The square root of 1285956 is 1134.
It is a perfect power (a square), and thus also a powerful number.
It is an interprime number because it is at equal distance from previous prime (1285943) and next prime (1285969).
It is a tau number, because it is divible by the number of its divisors (81).
It is a Harshad number since it is a multiple of its sum of digits (36).
Its product of digits (21600) is a multiple of the sum of its prime divisors (12).
It is a self number, because there is not a number n which added to its sum of digits gives 1285956.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 183705 + ... + 183711.
21285956 is an apocalyptic number.
1285956 is the 1134-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1285956
1285956 is an abundant number, since it is smaller than the sum of its proper divisors (2640603).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1285956 is an frugal number, since it uses more digits than its factorization.
1285956 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 42 (or 12 counting only the distinct ones).
The product of its digits is 21600, while the sum is 36.
The cubic root of 1285956 is about 108.7448511236.
Multiplying 1285956 by its sum of digits (36), we get a square (46294416 = 68042).
1285956 divided by its sum of digits (36) gives a square (35721 = 1892).
It can be divided in two parts, 128 and 5956, that added together give a square (6084 = 782).
The spelling of 1285956 in words is "one million, two hundred eighty-five thousand, nine hundred fifty-six".
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