40038637 has 2 divisors, whose sum is σ = 40038638. Its totient is φ = 40038636.

The previous prime is 40038629. The next prime is 40038667. The reversal of 40038637 is 73683004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22221796 + 17816841 = 4714^2 + 4221^2 .

It is a cyclic number.

It is not a de Polignac number, because 40038637 - 2³ = 40038629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40038599 and 40038608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40038667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20019318 + 20019319.

It is an arithmetic number, because the mean of its divisors is an integer number (20019319).

Almost surely, 2^40038637 is an apocalyptic number.

It is an amenable number.

40038637 is a deficient number, since it is larger than the sum of its proper divisors (1).

40038637 is an equidigital number, since it uses as much as digits as its factorization.

40038637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 40038637 is about 6327.6091061316. The cubic root of 40038637 is about 342.1052678015.

The spelling of 40038637 in words is "forty million, thirty-eight thousand, six hundred thirty-seven".