1249665456 has 40 divisors (see below), whose sum is σ = 3476635120. Its totient is φ = 384512256.

The previous prime is 1249665451. The next prime is 1249665467. The reversal of 1249665456 is 6545669421.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1249665451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000711 + ... + 1001958.

It is an arithmetic number, because the mean of its divisors is an integer number (86915878).

Almost surely, 2^1249665456 is an apocalyptic number.

1249665456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1249665456 is an abundant number, since it is smaller than the sum of its proper divisors (2226969664).

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

1249665456 is a wasteful number, since it uses less digits than its factorization.

1249665456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002693 (or 2002687 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 48.

The square root of 1249665456 is about 35350.6075761082. The cubic root of 1249665456 is about 1077.1212360149.

The spelling of 1249665456 in words is "one billion, two hundred forty-nine million, six hundred sixty-five thousand, four hundred fifty-six".