1390664 has 16 divisors (see below), whose sum is σ = 2844720. Its totient is φ = 632080.

The previous prime is 1390643. The next prime is 1390681. The reversal of 1390664 is 4660931.

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, 7814 + ... + 7989.

It is an arithmetic number, because the mean of its divisors is an integer number (177795).

2^1390664 is an apocalyptic number.

It is an amenable number.

1390664 is an abundant number, since it is smaller than the sum of its proper divisors (1454056).

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

1390664 is a wasteful number, since it uses less digits than its factorization.

1390664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15820 (or 15816 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1390664 is about 1179.2641773581. The cubic root of 1390664 is about 111.6196708259.

The spelling of 1390664 in words is "one million, three hundred ninety thousand, six hundred sixty-four".