40131409 has 2 divisors, whose sum is σ = 40131410. Its totient is φ = 40131408.

The previous prime is 40131397. The next prime is 40131437. The reversal of 40131409 is 90413104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20903184 + 19228225 = 4572^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 40131409 - 2⁷ = 40131281 is a prime.

It is a super-2 number, since 2×40131409² = 3221059976650562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40131409.

It is not a weakly prime, because it can be changed into another prime (40131449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20065704 + 20065705.

It is an arithmetic number, because the mean of its divisors is an integer number (20065705).

Almost surely, 2^40131409 is an apocalyptic number.

It is an amenable number.

40131409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40131409 is an equidigital number, since it uses as much as digits as its factorization.

40131409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 40131409 is about 6334.9355955684. The cubic root of 40131409 is about 342.3692903472.

The spelling of 40131409 in words is "forty million, one hundred thirty-one thousand, four hundred nine".