1251388964 has 24 divisors (see below), whose sum is σ = 2503583040. Its totient is φ = 536137056.

The previous prime is 1251388961. The next prime is 1251388969. The reversal of 1251388964 is 4698831521.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1251388961) 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, 122402 + ... + 132230.

It is an arithmetic number, because the mean of its divisors is an integer number (104315960).

Almost surely, 2^1251388964 is an apocalyptic number.

1251388964 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1251388964 is an abundant number, since it is smaller than the sum of its proper divisors (1252194076).

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

1251388964 is a wasteful number, since it uses less digits than its factorization.

1251388964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14387 (or 14385 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 1251388964 is about 35374.9765229604. The cubic root of 1251388964 is about 1077.6161882880.

The spelling of 1251388964 in words is "one billion, two hundred fifty-one million, three hundred eighty-eight thousand, nine hundred sixty-four".