15980845 has 4 divisors (see below), whose sum is σ = 19177020. Its totient is φ = 12784672.

The previous prime is 15980819. The next prime is 15980863. The reversal of 15980845 is 54808951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8462281 + 7518564 = 2909^2 + 2742^2 .

It is a cyclic number.

It is not a de Polignac number, because 15980845 - 2⁹ = 15980333 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 15980798 and 15980807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1598080 + ... + 1598089.

It is an arithmetic number, because the mean of its divisors is an integer number (4794255).

Almost surely, 2^15980845 is an apocalyptic number.

It is an amenable number.

15980845 is a deficient number, since it is larger than the sum of its proper divisors (3196175).

15980845 is an equidigital number, since it uses as much as digits as its factorization.

15980845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196174.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 15980845 is about 3997.6049079418. The cubic root of 15980845 is about 251.8836123748.

The spelling of 15980845 in words is "fifteen million, nine hundred eighty thousand, eight hundred forty-five".