18980639 has 8 divisors (see below), whose sum is σ = 20022000. Its totient is φ = 17943552.

The previous prime is 18980629. The next prime is 18980659. The reversal of 18980639 is 93608981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18980639 - 2⁸ = 18980383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18980639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18980629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12767 + ... + 14175.

It is an arithmetic number, because the mean of its divisors is an integer number (2502750).

Almost surely, 2^18980639 is an apocalyptic number.

18980639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18980639 is a deficient number, since it is larger than the sum of its proper divisors (1041361).

18980639 is a wasteful number, since it uses less digits than its factorization.

18980639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2137.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18980639 is about 4356.6775184767. The cubic root of 18980639 is about 266.7494973592.

The spelling of 18980639 in words is "eighteen million, nine hundred eighty thousand, six hundred thirty-nine".