1249391664 has 60 divisors (see below), whose sum is σ = 3680599000. Its totient is φ = 394543872.

The previous prime is 1249391657. The next prime is 1249391687. The reversal of 1249391664 is 4661939421.

1249391664 is a `hidden beast` number, since 12 + 493 + 91 + 6 + 64 = 666.

It is a nude number because it is divisible by every one of its digits.

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, 225589 + ... + 231060.

Almost surely, 2^1249391664 is an apocalyptic number.

It is an amenable number.

1249391664 is an abundant number, since it is smaller than the sum of its proper divisors (2431207336).

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

1249391664 is a wasteful number, since it uses less digits than its factorization.

1249391664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456682 (or 456673 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 1249391664 is about 35346.7348421322. The cubic root of 1249391664 is about 1077.0425673024.

The spelling of 1249391664 in words is "one billion, two hundred forty-nine million, three hundred ninety-one thousand, six hundred sixty-four".