40128725 has 48 divisors (see below), whose sum is σ = 63329280. Its totient is φ = 24537600.

The previous prime is 40128719. The next prime is 40128731. The reversal of 40128725 is 52782104.

It is an interprime number because it is at equal distance from previous prime (40128719) and next prime (40128731).

It is not a de Polignac number, because 40128725 - 2⁸ = 40128469 is a prime.

It is a super-2 number, since 2×40128725² = 3220629140251250, which contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 70241 + ... + 70809.

It is an arithmetic number, because the mean of its divisors is an integer number (1319360).

Almost surely, 2^40128725 is an apocalyptic number.

It is an amenable number.

40128725 is a deficient number, since it is larger than the sum of its proper divisors (23200555).

40128725 is a wasteful number, since it uses less digits than its factorization.

40128725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 40128725 is about 6334.7237508829. The cubic root of 40128725 is about 342.3616575920.

The spelling of 40128725 in words is "forty million, one hundred twenty-eight thousand, seven hundred twenty-five".