1390625565 has 32 divisors (see below), whose sum is σ = 2546712576. Its totient is φ = 634751040.

The previous prime is 1390625549. The next prime is 1390625611. The reversal of 1390625565 is 5655260931.

It is not a de Polignac number, because 1390625565 - 2⁴ = 1390625549 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62020 + ... + 81410.

It is an arithmetic number, because the mean of its divisors is an integer number (79584768).

Almost surely, 2^1390625565 is an apocalyptic number.

1390625565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1390625565 is a deficient number, since it is larger than the sum of its proper divisors (1156087011).

1390625565 is a wasteful number, since it uses less digits than its factorization.

1390625565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20089.

The product of its (nonzero) digits is 243000, while the sum is 42.

The square root of 1390625565 is about 37291.0923009772. The cubic root of 1390625565 is about 1116.1864250620.

The spelling of 1390625565 in words is "one billion, three hundred ninety million, six hundred twenty-five thousand, five hundred sixty-five".