15951980 has 48 divisors (see below), whose sum is σ = 37739520. Its totient is φ = 5611200.

The previous prime is 15951979. The next prime is 15951989. The reversal of 15951980 is 8915951.

It is not an unprimeable number, because it can be changed into a prime (15951989) 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 15 ways as a sum of consecutive naturals, for example, 5651 + ... + 7989.

It is an arithmetic number, because the mean of its divisors is an integer number (786240).

Almost surely, 2^15951980 is an apocalyptic number.

15951980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15951980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18869760).

15951980 is an abundant number, since it is smaller than the sum of its proper divisors (21787540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15951980 is a wasteful number, since it uses less digits than its factorization.

15951980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390 (or 2388 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 15951980 is about 3993.9929894781. The cubic root of 15951980 is about 251.7318681600.

The spelling of 15951980 in words is "fifteen million, nine hundred fifty-one thousand, nine hundred eighty".