17919980 has 48 divisors (see below), whose sum is σ = 40877760. Its totient is φ = 6559488.

The previous prime is 17919977. The next prime is 17919991. The reversal of 17919980 is 8991971.

It is a super-2 number, since 2×17919980² = 642251366400800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40601 + ... + 41039.

It is an arithmetic number, because the mean of its divisors is an integer number (851620).

Almost surely, 2^17919980 is an apocalyptic number.

17919980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17919980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20438880).

17919980 is an abundant number, since it is smaller than the sum of its proper divisors (22957780).

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

17919980 is a wasteful number, since it uses less digits than its factorization.

17919980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 17919980 is about 4233.1997354247. The cubic root of 17919980 is about 261.6852074619.

The spelling of 17919980 in words is "seventeen million, nine hundred nineteen thousand, nine hundred eighty".