1391938144 has 12 divisors (see below), whose sum is σ = 2740378284. Its totient is φ = 695969056.

The previous prime is 1391938139. The next prime is 1391938193. The reversal of 1391938144 is 4418391931.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1391938144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21749002 + ... + 21749065.

It is an arithmetic number, because the mean of its divisors is an integer number (228364857).

Almost surely, 2^1391938144 is an apocalyptic number.

It is an amenable number.

1391938144 is a deficient number, since it is larger than the sum of its proper divisors (1348440140).

1391938144 is an equidigital number, since it uses as much as digits as its factorization.

1391938144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43498077 (or 43498069 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 1391938144 is about 37308.6872457341. The cubic root of 1391938144 is about 1116.5374953974.

The spelling of 1391938144 in words is "one billion, three hundred ninety-one million, nine hundred thirty-eight thousand, one hundred forty-four".