40215625 has 24 divisors (see below), whose sum is σ = 53293464. Its totient is φ = 30240000.

The previous prime is 40215599. The next prime is 40215631. The reversal of 40215625 is 52651204.

It can be written as a sum of positive squares in 12 ways, for example, as 37847104 + 2368521 = 6152^2 + 1539^2 .

It is not a de Polignac number, because 40215625 - 2⁹ = 40215113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40215625.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52747 + ... + 53503.

It is an arithmetic number, because the mean of its divisors is an integer number (2220561).

Almost surely, 2^40215625 is an apocalyptic number.

It is an amenable number.

40215625 is a deficient number, since it is larger than the sum of its proper divisors (13077839).

40215625 is an frugal number, since it uses more digits than its factorization.

40215625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 40215625 is about 6341.5790620318. The cubic root of 40215625 is about 342.6086110159.

Adding to 40215625 its reverse (52651204), we get a palindrome (92866829).

The spelling of 40215625 in words is "forty million, two hundred fifteen thousand, six hundred twenty-five".