1391338744 has 16 divisors (see below), whose sum is σ = 2664266400. Its totient is φ = 680867712.

The previous prime is 1391338723. The next prime is 1391338801. The reversal of 1391338744 is 4478331931.

It is a self number, because there is not a number n which added to its sum of digits gives 1391338744.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1849809 + ... + 1850560.

It is an arithmetic number, because the mean of its divisors is an integer number (166516650).

Almost surely, 2^1391338744 is an apocalyptic number.

It is an amenable number.

1391338744 is a deficient number, since it is larger than the sum of its proper divisors (1272927656).

1391338744 is a wasteful number, since it uses less digits than its factorization.

1391338744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3700422 (or 3700418 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 1391338744 is about 37300.6533991028. The cubic root of 1391338744 is about 1116.3772036331.

The spelling of 1391338744 in words is "one billion, three hundred ninety-one million, three hundred thirty-eight thousand, seven hundred forty-four".