1390864 has 10 divisors (see below), whose sum is σ = 2694830. Its totient is φ = 695424.

The previous prime is 1390859. The next prime is 1390891. The reversal of 1390864 is 4680931.

It can be written as a sum of positive squares in only one way, i.e., 1040400 + 350464 = 1020^2 + 592^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43449 + ... + 43480.

It is an arithmetic number, because the mean of its divisors is an integer number (269483).

2^1390864 is an apocalyptic number.

It is an amenable number.

1390864 is a deficient number, since it is larger than the sum of its proper divisors (1303966).

1390864 is an equidigital number, since it uses as much as digits as its factorization.

1390864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86937 (or 86931 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1390864 is about 1179.3489729508. The cubic root of 1390864 is about 111.6250214747.

The spelling of 1390864 in words is "one million, three hundred ninety thousand, eight hundred sixty-four".