40138625 has 8 divisors (see below), whose sum is σ = 50093160. Its totient is φ = 32110800.

The previous prime is 40138607. The next prime is 40138661. The reversal of 40138625 is 52683104.

It can be written as a sum of positive squares in 4 ways, for example, as 2879809 + 37258816 = 1697^2 + 6104^2 .

It is not a de Polignac number, because 40138625 - 2¹⁸ = 39876481 is a prime.

It is a super-2 number, since 2×40138625² = 3222218433781250, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160430 + ... + 160679.

It is an arithmetic number, because the mean of its divisors is an integer number (6261645).

Almost surely, 2^40138625 is an apocalyptic number.

It is an amenable number.

40138625 is a deficient number, since it is larger than the sum of its proper divisors (9954535).

40138625 is an equidigital number, since it uses as much as digits as its factorization.

40138625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321124 (or 321114 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 40138625 is about 6335.5051100919. The cubic root of 40138625 is about 342.3898095100.

The spelling of 40138625 in words is "forty million, one hundred thirty-eight thousand, six hundred twenty-five".