1390631968 has 24 divisors (see below), whose sum is σ = 2986698960. Its totient is φ = 632105280.

The previous prime is 1390631951. The next prime is 1390631981. The reversal of 1390631968 is 8691360931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1974978 + ... + 1975681.

It is an arithmetic number, because the mean of its divisors is an integer number (124445790).

Almost surely, 2^1390631968 is an apocalyptic number.

It is an amenable number.

1390631968 is an abundant number, since it is smaller than the sum of its proper divisors (1596066992).

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

1390631968 is a wasteful number, since it uses less digits than its factorization.

1390631968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3950680 (or 3950672 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 1390631968 is about 37291.1781524800. The cubic root of 1390631968 is about 1116.1881381833.

The spelling of 1390631968 in words is "one billion, three hundred ninety million, six hundred thirty-one thousand, nine hundred sixty-eight".