15694139 has 2 divisors, whose sum is σ = 15694140. Its totient is φ = 15694138.

The previous prime is 15694127. The next prime is 15694169. The reversal of 15694139 is 93149651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15694139 - 2¹² = 15690043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15694109) 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, 7847069 + 7847070.

It is an arithmetic number, because the mean of its divisors is an integer number (7847070).

Almost surely, 2^15694139 is an apocalyptic number.

15694139 is a deficient number, since it is larger than the sum of its proper divisors (1).

15694139 is an equidigital number, since it uses as much as digits as its factorization.

15694139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 15694139 is about 3961.5828907143. The cubic root of 15694139 is about 250.3681987857.

The spelling of 15694139 in words is "fifteen million, six hundred ninety-four thousand, one hundred thirty-nine".