16111980 has 48 divisors (see below), whose sum is σ = 50127840. Its totient is φ = 4296384.

The previous prime is 16111961. The next prime is 16111987. The reversal of 16111980 is 8911161.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (16111987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14379 + ... + 15458.

It is an arithmetic number, because the mean of its divisors is an integer number (1044330).

Almost surely, 2^16111980 is an apocalyptic number.

16111980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16111980 is an abundant number, since it is smaller than the sum of its proper divisors (34015860).

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

16111980 is a wasteful number, since it uses less digits than its factorization.

16111980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29855 (or 29847 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 16111980 is about 4013.9730940802. The cubic root of 16111980 is about 252.5707020257.

The spelling of 16111980 in words is "sixteen million, one hundred eleven thousand, nine hundred eighty".