40639507 has 2 divisors, whose sum is σ = 40639508. Its totient is φ = 40639506.

The previous prime is 40639463. The next prime is 40639517. The reversal of 40639507 is 70593604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40639507 - 2¹⁹ = 40115219 is a prime.

It is not a weakly prime, because it can be changed into another prime (40639517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20319753 + 20319754.

It is an arithmetic number, because the mean of its divisors is an integer number (20319754).

Almost surely, 2^40639507 is an apocalyptic number.

40639507 is a deficient number, since it is larger than the sum of its proper divisors (1).

40639507 is an equidigital number, since it uses as much as digits as its factorization.

40639507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 40639507 is about 6374.9123131224. The cubic root of 40639507 is about 343.8081311276.

The spelling of 40639507 in words is "forty million, six hundred thirty-nine thousand, five hundred seven".