15998413 has 2 divisors, whose sum is σ = 15998414. Its totient is φ = 15998412.

The previous prime is 15998407. The next prime is 15998417. The reversal of 15998413 is 31489951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10252804 + 5745609 = 3202^2 + 2397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15998413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15998417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7999206 + 7999207.

It is an arithmetic number, because the mean of its divisors is an integer number (7999207).

Almost surely, 2^15998413 is an apocalyptic number.

It is an amenable number.

15998413 is a deficient number, since it is larger than the sum of its proper divisors (1).

15998413 is an equidigital number, since it uses as much as digits as its factorization.

15998413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 15998413 is about 3999.8016200807. The cubic root of 15998413 is about 251.9758784756.

The spelling of 15998413 in words is "fifteen million, nine hundred ninety-eight thousand, four hundred thirteen".