40115725 has 12 divisors (see below), whose sum is σ = 53570356. Its totient is φ = 29623680.

The previous prime is 40115723. The next prime is 40115741. The reversal of 40115725 is 52751104.

It can be written as a sum of positive squares in 6 ways, for example, as 2832489 + 37283236 = 1683^2 + 6106^2 .

It is not a de Polignac number, because 40115725 - 2¹ = 40115723 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

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 40115725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40115723) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 61392 + ... + 62041.

Almost surely, 2^40115725 is an apocalyptic number.

It is an amenable number.

40115725 is a deficient number, since it is larger than the sum of its proper divisors (13454631).

40115725 is a wasteful number, since it uses less digits than its factorization.

40115725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123456 (or 123451 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 40115725 is about 6333.6975772451. The cubic root of 40115725 is about 342.3246833942.

Adding to 40115725 its reverse (52751104), we get a palindrome (92866829).

The spelling of 40115725 in words is "forty million, one hundred fifteen thousand, seven hundred twenty-five".