15988945 has 16 divisors (see below), whose sum is σ = 22377600. Its totient is φ = 10962672.

The previous prime is 15988927. The next prime is 15988967. The reversal of 15988945 is 54988951.

It is not a de Polignac number, because 15988945 - 2¹⁷ = 15857873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2947 + ... + 6376.

It is an arithmetic number, because the mean of its divisors is an integer number (1398600).

Almost surely, 2^15988945 is an apocalyptic number.

It is an amenable number.

15988945 is a deficient number, since it is larger than the sum of its proper divisors (6388655).

15988945 is an frugal number, since it uses more digits than its factorization.

15988945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9349 (or 9335 counting only the distinct ones).

The product of its digits is 518400, while the sum is 49.

The square root of 15988945 is about 3998.6178862202. The cubic root of 15988945 is about 251.9261614943.

The spelling of 15988945 in words is "fifteen million, nine hundred eighty-eight thousand, nine hundred forty-five".