39890693 has 2 divisors, whose sum is σ = 39890694. Its totient is φ = 39890692.

The previous prime is 39890681. The next prime is 39890737. The reversal of 39890693 is 39609893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37478884 + 2411809 = 6122^2 + 1553^2 .

It is a cyclic number.

It is not a de Polignac number, because 39890693 - 2⁶ = 39890629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39890603) 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, 19945346 + 19945347.

It is an arithmetic number, because the mean of its divisors is an integer number (19945347).

Almost surely, 2^39890693 is an apocalyptic number.

It is an amenable number.

39890693 is a deficient number, since it is larger than the sum of its proper divisors (1).

39890693 is an equidigital number, since it uses as much as digits as its factorization.

39890693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 39890693 is about 6315.9079315646. The cubic root of 39890693 is about 341.6833845743.

The spelling of 39890693 in words is "thirty-nine million, eight hundred ninety thousand, six hundred ninety-three".