18145988 has 48 divisors (see below), whose sum is σ = 39889920. Its totient is φ = 7042464.

The previous prime is 18145973. The next prime is 18145991. The reversal of 18145988 is 88954181.

18145988 = T₃₉₂ + T₃₉₃ + ... + T₅₅₂.

It is a super-2 number, since 2×18145988² = 658553760992288, which contains 22 as substring.

Its product of digits (92160) is a multiple of the sum of its prime factors (1536).

It is a congruent number.

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, 11495 + ... + 12977.

It is an arithmetic number, because the mean of its divisors is an integer number (831040).

Almost surely, 2^18145988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18145988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19944960).

18145988 is an abundant number, since it is smaller than the sum of its proper divisors (21743932).

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

18145988 is a wasteful number, since it uses less digits than its factorization.

18145988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536 (or 1534 counting only the distinct ones).

The product of its digits is 92160, while the sum is 44.

The square root of 18145988 is about 4259.8107939203. The cubic root of 18145988 is about 262.7807451372.

The spelling of 18145988 in words is "eighteen million, one hundred forty-five thousand, nine hundred eighty-eight".