1391338724 has 12 divisors (see below), whose sum is σ = 2540705664. Its totient is φ = 665422824.

The previous prime is 1391338723. The next prime is 1391338801. The reversal of 1391338724 is 4278331931.

It is not an unprimeable number, because it can be changed into a prime (1391338723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7561532 + ... + 7561715.

It is an arithmetic number, because the mean of its divisors is an integer number (211725472).

Almost surely, 2^1391338724 is an apocalyptic number.

It is an amenable number.

1391338724 is a deficient number, since it is larger than the sum of its proper divisors (1149366940).

1391338724 is a wasteful number, since it uses less digits than its factorization.

1391338724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15123274 (or 15123272 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 1391338724 is about 37300.6531310110. The cubic root of 1391338724 is about 1116.3771982839.

The spelling of 1391338724 in words is "one billion, three hundred ninety-one million, three hundred thirty-eight thousand, seven hundred twenty-four".