40129237 has 2 divisors, whose sum is σ = 40129238. Its totient is φ = 40129236.

The previous prime is 40129223. The next prime is 40129241. The reversal of 40129237 is 73292104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20848356 + 19280881 = 4566^2 + 4391^2 .

It is a cyclic number.

It is not a de Polignac number, because 40129237 - 2²³ = 31740629 is a prime.

It is a super-2 number, since 2×40129237² = 3220711324404338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40129207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20064618 + 20064619.

It is an arithmetic number, because the mean of its divisors is an integer number (20064619).

Almost surely, 2^40129237 is an apocalyptic number.

It is an amenable number.

40129237 is a deficient number, since it is larger than the sum of its proper divisors (1).

40129237 is an equidigital number, since it uses as much as digits as its factorization.

40129237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 40129237 is about 6334.7641629346. The cubic root of 40129237 is about 342.3631136431.

The spelling of 40129237 in words is "forty million, one hundred twenty-nine thousand, two hundred thirty-seven".