1249999956 has 36 divisors (see below), whose sum is σ = 3164982912. Its totient is φ = 415972944.

The previous prime is 1249999903. The next prime is 1249999967. The reversal of 1249999956 is 6599999421.

It is a happy number.

1249999956 is a `hidden beast` number, since 1 + 2 + 499 + 9 + 99 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 1249999893 and 1249999902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6750 + ... + 50453.

It is an arithmetic number, because the mean of its divisors is an integer number (87916192).

Almost surely, 2^1249999956 is an apocalyptic number.

It is an amenable number.

1249999956 is an abundant number, since it is smaller than the sum of its proper divisors (1914982956).

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

1249999956 is a wasteful number, since it uses less digits than its factorization.

1249999956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57820 (or 57815 counting only the distinct ones).

The product of its digits is 14171760, while the sum is 63.

The square root of 1249999956 is about 35355.3384370734. The cubic root of 1249999956 is about 1077.2173323766.

The spelling of 1249999956 in words is "one billion, two hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred fifty-six".