1285939 has 8 divisors (see below), whose sum is σ = 1380240. Its totient is φ = 1194336.

The previous prime is 1285937. The next prime is 1285943. The reversal of 1285939 is 9395821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1285939 - 2¹ = 1285937 is a prime.

It is a super-2 number, since 2×1285939² = 3307278223442, which contains 22 as substring.

It is a Duffinian number.

1285939 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1285898 and 1285907.

It is not an unprimeable number, because it can be changed into a prime (1285937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369 + ... + 1645.

It is an arithmetic number, because the mean of its divisors is an integer number (172530).

2^1285939 is an apocalyptic number.

1285939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1285939 is a deficient number, since it is larger than the sum of its proper divisors (94301).

1285939 is a wasteful number, since it uses less digits than its factorization.

1285939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349.

The product of its digits is 19440, while the sum is 37.

The square root of 1285939 is about 1133.9925043844. The cubic root of 1285939 is about 108.7443719288.

It can be divided in two parts, 12859 and 39, that multiplied together give a triangular number (501501 = T₁₀₀₁).

The spelling of 1285939 in words is "one million, two hundred eighty-five thousand, nine hundred thirty-nine".