1390921836 has 12 divisors (see below), whose sum is σ = 3245484312. Its totient is φ = 463640608.

The previous prime is 1390921811. The next prime is 1390921921. The reversal of 1390921836 is 6381290931.

1390921836 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1390921836² = 3869327107723221792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57955065 + ... + 57955088.

It is an arithmetic number, because the mean of its divisors is an integer number (270457026).

Almost surely, 2^1390921836 is an apocalyptic number.

It is an amenable number.

1390921836 is an abundant number, since it is smaller than the sum of its proper divisors (1854562476).

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

1390921836 is a wasteful number, since it uses less digits than its factorization.

1390921836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115910160 (or 115910158 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 1390921836 is about 37295.0644992069. The cubic root of 1390921836 is about 1116.2656867974.

The spelling of 1390921836 in words is "one billion, three hundred ninety million, nine hundred twenty-one thousand, eight hundred thirty-six".