18678980 has 12 divisors (see below), whose sum is σ = 39225900. Its totient is φ = 7471584.

The previous prime is 18678977. The next prime is 18679009. The reversal of 18678980 is 8987681.

It can be written as a sum of positive squares in 2 ways, for example, as 7496644 + 11182336 = 2738^2 + 3344^2 .

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, 466955 + ... + 466994.

It is an arithmetic number, because the mean of its divisors is an integer number (3268825).

Almost surely, 2^18678980 is an apocalyptic number.

18678980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18678980 is an abundant number, since it is smaller than the sum of its proper divisors (20546920).

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

18678980 is a wasteful number, since it uses less digits than its factorization.

18678980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933958 (or 933956 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 18678980 is about 4321.9185554566. The cubic root of 18678980 is about 265.3287956318.

The spelling of 18678980 in words is "eighteen million, six hundred seventy-eight thousand, nine hundred eighty".