1249426656 has 72 divisors (see below), whose sum is σ = 3649116744. Its totient is φ = 405216000.

The previous prime is 1249426627. The next prime is 1249426669. The reversal of 1249426656 is 6566249421.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×1249426656² = 3122133937446684672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47970 + ... + 69281.

It is an arithmetic number, because the mean of its divisors is an integer number (50682177).

Almost surely, 2^1249426656 is an apocalyptic number.

1249426656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1249426656 is an abundant number, since it is smaller than the sum of its proper divisors (2399690088).

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

1249426656 is a wasteful number, since it uses less digits than its factorization.

1249426656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117304 (or 117293 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 1249426656 is about 35347.2298207370. The cubic root of 1249426656 is about 1077.0526222016.

The spelling of 1249426656 in words is "one billion, two hundred forty-nine million, four hundred twenty-six thousand, six hundred fifty-six".