19117980 has 72 divisors (see below), whose sum is σ = 66280032. Its totient is φ = 4369536.

The previous prime is 19117963. The next prime is 19117997. The reversal of 19117980 is 8971191.

It is an interprime number because it is at equal distance from previous prime (19117963) and next prime (19117997).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6327 + ... + 8846.

It is an arithmetic number, because the mean of its divisors is an integer number (920556).

Almost surely, 2^19117980 is an apocalyptic number.

19117980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19117980 is an abundant number, since it is smaller than the sum of its proper divisors (47162052).

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

19117980 is a wasteful number, since it uses less digits than its factorization.

19117980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15195 (or 15190 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 19117980 is about 4372.4112340904. The cubic root of 19117980 is about 267.3913379372.

The spelling of 19117980 in words is "nineteen million, one hundred seventeen thousand, nine hundred eighty".