1285957 has 4 divisors (see below), whose sum is σ = 1288876. Its totient is φ = 1283040.

The previous prime is 1285943. The next prime is 1285969. The reversal of 1285957 is 7595821.

It is a Cunningham number, because it is equal to 1134²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 509796 + 776161 = 714^2 + 881^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285957 - 2¹⁹ = 761669 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648 + ... + 1729.

It is an arithmetic number, because the mean of its divisors is an integer number (322219).

2^1285957 is an apocalyptic number.

It is an amenable number.

1285957 is a deficient number, since it is larger than the sum of its proper divisors (2919).

1285957 is an equidigital number, since it uses as much as digits as its factorization.

1285957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918.

The product of its digits is 25200, while the sum is 37.

The square root of 1285957 is about 1134.0004409170. Note that the first 3 decimals coincide. The cubic root of 1285957 is about 108.7448793114.

The spelling of 1285957 in words is "one million, two hundred eighty-five thousand, nine hundred fifty-seven".