1390625 has 14 divisors (see below), whose sum is σ = 1757790. Its totient is φ = 1100000.

The previous prime is 1390621. The next prime is 1390633. The reversal of 1390625 is 5260931.

It can be written as a sum of positive squares in 7 ways, for example, as 1336336 + 54289 = 1156^2 + 233^2 .

It is not a de Polignac number, because 1390625 - 2² = 1390621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1390594 and 1390603.

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

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 15581 + ... + 15669.

2^1390625 is an apocalyptic number.

It is an amenable number.

1390625 is a deficient number, since it is larger than the sum of its proper divisors (367165).

1390625 is an frugal number, since it uses more digits than its factorization.

1390625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 1390625 is about 1179.2476415071. The cubic root of 1390625 is about 111.6186273896.

It can be divided in two parts, 13906 and 25, that added together give a palindrome (13931).

The spelling of 1390625 in words is "one million, three hundred ninety thousand, six hundred twenty-five".