1380664 has 8 divisors (see below), whose sum is σ = 2588760. Its totient is φ = 690328.

The previous prime is 1380653. The next prime is 1380671. The reversal of 1380664 is 4660831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86284 + ... + 86299.

It is an arithmetic number, because the mean of its divisors is an integer number (323595).

2^1380664 is an apocalyptic number.

It is an amenable number.

1380664 is a deficient number, since it is larger than the sum of its proper divisors (1208096).

1380664 is a wasteful number, since it uses less digits than its factorization.

1380664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172589 (or 172585 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1380664 is about 1175.0165956275. The cubic root of 1380664 is about 111.3514816969.

The spelling of 1380664 in words is "one million, three hundred eighty thousand, six hundred sixty-four".