1257285965 has 16 divisors (see below), whose sum is σ = 1631000448. Its totient is φ = 924914496.

The previous prime is 1257285919. The next prime is 1257285971. The reversal of 1257285965 is 5695827521.

It is a cyclic number.

It is not a de Polignac number, because 1257285965 - 2⁸ = 1257285709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19679 + ... + 53868.

It is an arithmetic number, because the mean of its divisors is an integer number (101937528).

Almost surely, 2^1257285965 is an apocalyptic number.

It is an amenable number.

1257285965 is a deficient number, since it is larger than the sum of its proper divisors (373714483).

1257285965 is a wasteful number, since it uses less digits than its factorization.

1257285965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73828.

The product of its digits is 1512000, while the sum is 50.

The square root of 1257285965 is about 35458.2284526455. The cubic root of 1257285965 is about 1079.3062431203.

The spelling of 1257285965 in words is "one billion, two hundred fifty-seven million, two hundred eighty-five thousand, nine hundred sixty-five".