1391275388 has 24 divisors (see below), whose sum is σ = 2521580544. Its totient is φ = 671241200.

The previous prime is 1391275367. The next prime is 1391275397. The reversal of 1391275388 is 8835721931.

It is a Harshad number since it is a multiple of its sum of digits (47).

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, 38768 + ... + 65463.

It is an arithmetic number, because the mean of its divisors is an integer number (105065856).

Almost surely, 2^1391275388 is an apocalyptic number.

It is an amenable number.

1391275388 is a deficient number, since it is larger than the sum of its proper divisors (1130305156).

1391275388 is a wasteful number, since it uses less digits than its factorization.

1391275388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104353 (or 104351 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 1391275388 is about 37299.8041281720. The cubic root of 1391275388 is about 1116.3602582587.

The spelling of 1391275388 in words is "one billion, three hundred ninety-one million, two hundred seventy-five thousand, three hundred eighty-eight".