1256081900 has 18 divisors (see below), whose sum is σ = 2725697940. Its totient is φ = 502432720.

The previous prime is 1256081867. The next prime is 1256081903. The reversal of 1256081900 is 91806521.

It is a super-2 number, since 2×1256081900² = 3155483479015220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1256081903) 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 5 ways as a sum of consecutive naturals, for example, 6280310 + ... + 6280509.

Almost surely, 2^1256081900 is an apocalyptic number.

1256081900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256081900 is an abundant number, since it is smaller than the sum of its proper divisors (1469616040).

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

1256081900 is a wasteful number, since it uses less digits than its factorization.

1256081900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12560833 (or 12560826 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 1256081900 is about 35441.2457455999. The cubic root of 1256081900 is about 1078.9615933543.

The spelling of 1256081900 in words is "one billion, two hundred fifty-six million, eighty-one thousand, nine hundred".