15990897 has 32 divisors (see below), whose sum is σ = 24675840. Its totient is φ = 9123840.

The previous prime is 15990881. The next prime is 15990899. The reversal of 15990897 is 79809951.

It is not a de Polignac number, because 15990897 - 2⁴ = 15990881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15990899) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58872 + ... + 59142.

It is an arithmetic number, because the mean of its divisors is an integer number (771120).

Almost surely, 2^15990897 is an apocalyptic number.

15990897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

15990897 is a deficient number, since it is larger than the sum of its proper divisors (8684943).

15990897 is a wasteful number, since it uses less digits than its factorization.

15990897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 15990897 is about 3998.8619631090. The cubic root of 15990897 is about 251.9364131579.

The spelling of 15990897 in words is "fifteen million, nine hundred ninety thousand, eight hundred ninety-seven".