15998407 has 2 divisors, whose sum is σ = 15998408. Its totient is φ = 15998406.

The previous prime is 15998383. The next prime is 15998413. The reversal of 15998407 is 70489951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15998407 - 2¹⁵ = 15965639 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, 7999203 + 7999204.

It is an arithmetic number, because the mean of its divisors is an integer number (7999204).

Almost surely, 2^15998407 is an apocalyptic number.

15998407 is a deficient number, since it is larger than the sum of its proper divisors (1).

15998407 is an equidigital number, since it uses as much as digits as its factorization.

15998407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 15998407 is about 3999.8008700434. The cubic root of 15998407 is about 251.9758469755.

The spelling of 15998407 in words is "fifteen million, nine hundred ninety-eight thousand, four hundred seven".