15998947 has 2 divisors, whose sum is σ = 15998948. Its totient is φ = 15998946.

The previous prime is 15998933. The next prime is 15998959. The reversal of 15998947 is 74989951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15998947 - 2¹⁹ = 15474659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15998894 and 15998903.

It is not a weakly prime, because it can be changed into another prime (15998977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7999473 + 7999474.

It is an arithmetic number, because the mean of its divisors is an integer number (7999474).

Almost surely, 2^15998947 is an apocalyptic number.

15998947 is a deficient number, since it is larger than the sum of its proper divisors (1).

15998947 is an equidigital number, since it uses as much as digits as its factorization.

15998947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 52.

The square root of 15998947 is about 3999.8683728343. The cubic root of 15998947 is about 251.9786819541.

The spelling of 15998947 in words is "fifteen million, nine hundred ninety-eight thousand, nine hundred forty-seven".