18761980 has 12 divisors (see below), whose sum is σ = 39400200. Its totient is φ = 7504784.

The previous prime is 18761959. The next prime is 18761983. The reversal of 18761980 is 8916781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18761983) 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 3 ways as a sum of consecutive naturals, for example, 469030 + ... + 469069.

It is an arithmetic number, because the mean of its divisors is an integer number (3283350).

Almost surely, 2^18761980 is an apocalyptic number.

18761980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18761980 is an abundant number, since it is smaller than the sum of its proper divisors (20638220).

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

18761980 is a wasteful number, since it uses less digits than its factorization.

18761980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938108 (or 938106 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18761980 is about 4331.5101292736. The cubic root of 18761980 is about 265.7212109147.

The spelling of 18761980 in words is "eighteen million, seven hundred sixty-one thousand, nine hundred eighty".