1390624 has 12 divisors (see below), whose sum is σ = 2737854. Its totient is φ = 695296.

The previous prime is 1390621. The next prime is 1390633. The reversal of 1390624 is 4260931.

It can be written as a sum of positive squares in only one way, i.e., 1140624 + 250000 = 1068^2 + 500^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1390621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21697 + ... + 21760.

2^1390624 is an apocalyptic number.

It is an amenable number.

1390624 is a deficient number, since it is larger than the sum of its proper divisors (1347230).

1390624 is an equidigital number, since it uses as much as digits as its factorization.

1390624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43467 (or 43459 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1390624 is about 1179.2472175078. The cubic root of 1390624 is about 111.6186006346.

It can be divided in two parts, 1 and 390624, that added together give a 8-th power (390625 = 5⁸).

The spelling of 1390624 in words is "one million, three hundred ninety thousand, six hundred twenty-four".