1249910856 has 96 divisors (see below), whose sum is σ = 3660733440. Its totient is φ = 383768064.

The previous prime is 1249910843. The next prime is 1249910887. The reversal of 1249910856 is 6580199421.

1249910856 is a `hidden beast` number, since 1 + 2 + 499 + 108 + 56 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46665 + ... + 68391.

It is an arithmetic number, because the mean of its divisors is an integer number (38132640).

Almost surely, 2^1249910856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1249910856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1830366720).

1249910856 is an abundant number, since it is smaller than the sum of its proper divisors (2410822584).

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

1249910856 is a wasteful number, since it uses less digits than its factorization.

1249910856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21803 (or 21796 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1249910856 is about 35354.0783503120. The cubic root of 1249910856 is about 1077.1917370837.

The spelling of 1249910856 in words is "one billion, two hundred forty-nine million, nine hundred ten thousand, eight hundred fifty-six".