15400939 has 2 divisors, whose sum is σ = 15400940. Its totient is φ = 15400938.

The previous prime is 15400897. The next prime is 15400949. The reversal of 15400939 is 93900451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15400939 - 2¹⁹ = 14876651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15400939.

It is not a weakly prime, because it can be changed into another prime (15400949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7700469 + 7700470.

It is an arithmetic number, because the mean of its divisors is an integer number (7700470).

Almost surely, 2^15400939 is an apocalyptic number.

15400939 is a deficient number, since it is larger than the sum of its proper divisors (1).

15400939 is an equidigital number, since it uses as much as digits as its factorization.

15400939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 15400939 is about 3924.4030119242. The cubic root of 15400939 is about 248.7992500313.

The spelling of 15400939 in words is "fifteen million, four hundred thousand, nine hundred thirty-nine".