40405237 has 2 divisors, whose sum is σ = 40405238. Its totient is φ = 40405236.

The previous prime is 40405231. The next prime is 40405331. The reversal of 40405237 is 73250404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24196561 + 16208676 = 4919^2 + 4026^2 .

It is a cyclic number.

It is not a de Polignac number, because 40405237 - 2⁷ = 40405109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40405231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202618 + 20202619.

It is an arithmetic number, because the mean of its divisors is an integer number (20202619).

Almost surely, 2^40405237 is an apocalyptic number.

It is an amenable number.

40405237 is a deficient number, since it is larger than the sum of its proper divisors (1).

40405237 is an equidigital number, since it uses as much as digits as its factorization.

40405237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 40405237 is about 6356.5113859727. The cubic root of 40405237 is about 343.1462202441.

The spelling of 40405237 in words is "forty million, four hundred five thousand, two hundred thirty-seven".