40131399 has 16 divisors (see below), whose sum is σ = 66712320. Its totient is φ = 20847360.

The previous prime is 40131397. The next prime is 40131409. The reversal of 40131399 is 99313104.

40131399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40131399 - 2¹ = 40131397 is a prime.

It is a super-2 number, since 2×40131399² = 3221058371394402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40131397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86634 + ... + 87095.

It is an arithmetic number, because the mean of its divisors is an integer number (4169520).

Almost surely, 2^40131399 is an apocalyptic number.

40131399 is a deficient number, since it is larger than the sum of its proper divisors (26580921).

40131399 is a wasteful number, since it uses less digits than its factorization.

40131399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173750.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 40131399 is about 6334.9348062944. The cubic root of 40131399 is about 342.3692619099.

The spelling of 40131399 in words is "forty million, one hundred thirty-one thousand, three hundred ninety-nine".