1265405256 has 48 divisors (see below), whose sum is σ = 3545322300. Its totient is φ = 407256192.

The previous prime is 1265405201. The next prime is 1265405257. The reversal of 1265405256 is 6525045621.

1265405256 is a `hidden beast` number, since 12 + 6 + 540 + 52 + 56 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1263802500 + 1602756 = 35550^2 + 1266^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1265405256.

It is not an unprimeable number, because it can be changed into a prime (1265405257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 300931 + ... + 305106.

Almost surely, 2^1265405256 is an apocalyptic number.

It is an amenable number.

1265405256 is an abundant number, since it is smaller than the sum of its proper divisors (2279917044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265405256 is a wasteful number, since it uses less digits than its factorization.

1265405256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606078 (or 606071 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 1265405256 is about 35572.5351359725. The cubic root of 1265405256 is about 1081.6245715017.

The spelling of 1265405256 in words is "one billion, two hundred sixty-five million, four hundred five thousand, two hundred fifty-six".