1255865400 has 72 divisors (see below), whose sum is σ = 4217620680. Its totient is φ = 334896960.

The previous prime is 1255865399. The next prime is 1255865407. The reversal of 1255865400 is 45685521.

1255865400 is a `hidden beast` number, since 1 + 2 + 558 + 65 + 40 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255865407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 347052 + ... + 350651.

It is an arithmetic number, because the mean of its divisors is an integer number (58578065).

Almost surely, 2^1255865400 is an apocalyptic number.

1255865400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255865400 is an abundant number, since it is smaller than the sum of its proper divisors (2961755280).

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

1255865400 is a wasteful number, since it uses less digits than its factorization.

1255865400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697725 (or 697713 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 1255865400 is about 35438.1912630992. The cubic root of 1255865400 is about 1078.8995993588.

The spelling of 1255865400 in words is "one billion, two hundred fifty-five million, eight hundred sixty-five thousand, four hundred".