15890939 has 2 divisors, whose sum is σ = 15890940. Its totient is φ = 15890938.

The previous prime is 15890933. The next prime is 15890957. The reversal of 15890939 is 93909851.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15890939 - 2⁴ = 15890923 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15890939.

It is not a weakly prime, because it can be changed into another prime (15890933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7945469 + 7945470.

It is an arithmetic number, because the mean of its divisors is an integer number (7945470).

Almost surely, 2^15890939 is an apocalyptic number.

15890939 is a deficient number, since it is larger than the sum of its proper divisors (1).

15890939 is an equidigital number, since it uses as much as digits as its factorization.

15890939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 15890939 is about 3986.3440644280. The cubic root of 15890939 is about 251.4103697992.

The spelling of 15890939 in words is "fifteen million, eight hundred ninety thousand, nine hundred thirty-nine".