1256106120 has 32 divisors (see below), whose sum is σ = 3768318720. Its totient is φ = 334961600.

The previous prime is 1256106097. The next prime is 1256106127. The reversal of 1256106120 is 216016521.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1256106127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5233656 + ... + 5233895.

It is an arithmetic number, because the mean of its divisors is an integer number (117759960).

Almost surely, 2^1256106120 is an apocalyptic number.

1256106120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256106120 is an abundant number, since it is smaller than the sum of its proper divisors (2512212600).

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

1256106120 is a wasteful number, since it uses less digits than its factorization.

1256106120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10467565 (or 10467561 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1256106120 is about 35441.5874362309. The cubic root of 1256106120 is about 1078.9685282211.

The spelling of 1256106120 in words is "one billion, two hundred fifty-six million, one hundred six thousand, one hundred twenty".