1390317918 has 16 divisors (see below), whose sum is σ = 3033421056. Its totient is φ = 421308440.

The previous prime is 1390317911. The next prime is 1390317947. The reversal of 1390317918 is 8197130931.

It is a super-2 number, since 2×1390317918² = 3865967826223709448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1390317918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390317911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10532646 + ... + 10532777.

It is an arithmetic number, because the mean of its divisors is an integer number (189588816).

Almost surely, 2^1390317918 is an apocalyptic number.

1390317918 is an abundant number, since it is smaller than the sum of its proper divisors (1643103138).

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

1390317918 is a wasteful number, since it uses less digits than its factorization.

1390317918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21065439.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 1390317918 is about 37286.9671333028. The cubic root of 1390317918 is about 1116.1041079764.

The spelling of 1390317918 in words is "one billion, three hundred ninety million, three hundred seventeen thousand, nine hundred eighteen".