40643137 has 2 divisors, whose sum is σ = 40643138. Its totient is φ = 40643136.

The previous prime is 40643129. The next prime is 40643171. The reversal of 40643137 is 73134604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22316176 + 18326961 = 4724^2 + 4281^2 .

It is a cyclic number.

It is not a de Polignac number, because 40643137 - 2³ = 40643129 is a prime.

It is equal to p_2470348 and since 40643137 and 2470348 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40643117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20321568 + 20321569.

It is an arithmetic number, because the mean of its divisors is an integer number (20321569).

Almost surely, 2^40643137 is an apocalyptic number.

It is an amenable number.

40643137 is a deficient number, since it is larger than the sum of its proper divisors (1).

40643137 is an equidigital number, since it uses as much as digits as its factorization.

40643137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 40643137 is about 6375.1970165635. The cubic root of 40643137 is about 343.8183673604.

The spelling of 40643137 in words is "forty million, six hundred forty-three thousand, one hundred thirty-seven".