1391634772 has 24 divisors (see below), whose sum is σ = 2688773472. Its totient is φ = 624938400.

The previous prime is 1391634767. The next prime is 1391634791. The reversal of 1391634772 is 2774361931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186879 + ... + 194182.

It is an arithmetic number, because the mean of its divisors is an integer number (112032228).

Almost surely, 2^1391634772 is an apocalyptic number.

It is an amenable number.

1391634772 is a deficient number, since it is larger than the sum of its proper divisors (1297138700).

1391634772 is a wasteful number, since it uses less digits than its factorization.

1391634772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381159 (or 381157 counting only the distinct ones).

The product of its digits is 190512, while the sum is 43.

The square root of 1391634772 is about 37304.6213222973. The cubic root of 1391634772 is about 1116.4563733002.

The spelling of 1391634772 in words is "one billion, three hundred ninety-one million, six hundred thirty-four thousand, seven hundred seventy-two".