18890172 has 60 divisors (see below), whose sum is σ = 56444080. Its totient is φ = 5396544.

The previous prime is 18890167. The next prime is 18890177. The reversal of 18890172 is 27109881.

It is an interprime number because it is at equal distance from previous prime (18890167) and next prime (18890177).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18890177) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1897 + ... + 6432.

Almost surely, 2^18890172 is an apocalyptic number.

18890172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18890172 is an abundant number, since it is smaller than the sum of its proper divisors (37553908).

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

18890172 is a wasteful number, since it uses less digits than its factorization.

18890172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8352 (or 8341 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 18890172 is about 4346.2825494899. The cubic root of 18890172 is about 266.3250215094.

The spelling of 18890172 in words is "eighteen million, eight hundred ninety thousand, one hundred seventy-two".