15997047 has 24 divisors (see below), whose sum is σ = 23697408. Its totient is φ = 9591120.

The previous prime is 15997039. The next prime is 15997057. The reversal of 15997047 is 74079951.

It is a happy number.

It is not a de Polignac number, because 15997047 - 2³ = 15997039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45928 + ... + 46274.

It is an arithmetic number, because the mean of its divisors is an integer number (987392).

Almost surely, 2^15997047 is an apocalyptic number.

15997047 is a deficient number, since it is larger than the sum of its proper divisors (7700361).

15997047 is a wasteful number, since it uses less digits than its factorization.

15997047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 15997047 is about 3999.6308579668. The cubic root of 15997047 is about 251.9687067466.

It can be divided in two parts, 1599 and 7047, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 15997047 in words is "fifteen million, nine hundred ninety-seven thousand, forty-seven".