40015925 has 6 divisors (see below), whose sum is σ = 49619778. Its totient is φ = 32012720.

The previous prime is 40015903. The next prime is 40015961. The reversal of 40015925 is 52951004.

It can be written as a sum of positive squares in 3 ways, for example, as 2353156 + 37662769 = 1534^2 + 6137^2 .

It is not a de Polignac number, because 40015925 - 2⁸ = 40015669 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40015894 and 40015903.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 800294 + ... + 800343.

It is an arithmetic number, because the mean of its divisors is an integer number (8269963).

Almost surely, 2^40015925 is an apocalyptic number.

It is an amenable number.

40015925 is a deficient number, since it is larger than the sum of its proper divisors (9603853).

40015925 is a wasteful number, since it uses less digits than its factorization.

40015925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600647 (or 1600642 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 40015925 is about 6325.8141768471. The cubic root of 40015925 is about 342.0405689252.

Adding to 40015925 its reverse (52951004), we get a palindrome (92966929).

The spelling of 40015925 in words is "forty million, fifteen thousand, nine hundred twenty-five".