1256423520 has 96 divisors (see below), whose sum is σ = 4317546240. Its totient is φ = 304586240.

The previous prime is 1256423501. The next prime is 1256423551. The reversal of 1256423520 is 253246521.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113700 + ... + 124259.

It is an arithmetic number, because the mean of its divisors is an integer number (44974440).

Almost surely, 2^1256423520 is an apocalyptic number.

1256423520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256423520 is an abundant number, since it is smaller than the sum of its proper divisors (3061122720).

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

1256423520 is a wasteful number, since it uses less digits than its factorization.

1256423520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237988 (or 237980 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 1256423520 is about 35446.0649437988. The cubic root of 1256423520 is about 1079.0594005245.

The spelling of 1256423520 in words is "one billion, two hundred fifty-six million, four hundred twenty-three thousand, five hundred twenty".