17939980 has 24 divisors (see below), whose sum is σ = 38974320. Its totient is φ = 6928320.

The previous prime is 17939963. The next prime is 17939989. The reversal of 17939980 is 8993971.

It is a self number, because there is not a number n which added to its sum of digits gives 17939980.

It is not an unprimeable number, because it can be changed into a prime (17939989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14886 + ... + 16045.

It is an arithmetic number, because the mean of its divisors is an integer number (1623930).

Almost surely, 2^17939980 is an apocalyptic number.

17939980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

17939980 is an abundant number, since it is smaller than the sum of its proper divisors (21034340).

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

17939980 is a wasteful number, since it uses less digits than its factorization.

17939980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30969 (or 30967 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 17939980 is about 4235.5613559480. The cubic root of 17939980 is about 261.7825245030.

The spelling of 17939980 in words is "seventeen million, nine hundred thirty-nine thousand, nine hundred eighty".