1391918118 has 16 divisors (see below), whose sum is σ = 2836362096. Its totient is φ = 455218400.

The previous prime is 1391918107. The next prime is 1391918137. The reversal of 1391918118 is 8118191931.

It is a self number, because there is not a number n which added to its sum of digits gives 1391918118.

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, 2188233 + ... + 2188868.

It is an arithmetic number, because the mean of its divisors is an integer number (177272631).

Almost surely, 2^1391918118 is an apocalyptic number.

1391918118 is an abundant number, since it is smaller than the sum of its proper divisors (1444443978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391918118 is a wasteful number, since it uses less digits than its factorization.

1391918118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377159.

The product of its digits is 15552, while the sum is 42.

The square root of 1391918118 is about 37308.4188622354. The cubic root of 1391918118 is about 1116.5321407804.

The spelling of 1391918118 in words is "one billion, three hundred ninety-one million, nine hundred eighteen thousand, one hundred eighteen".