18088398 has 12 divisors (see below), whose sum is σ = 39191568. Its totient is φ = 6029460.

The previous prime is 18088387. The next prime is 18088403. The reversal of 18088398 is 89388081.

18088398 is a `hidden beast` number, since 180 + 88 + 398 = 666.

It is a super-4 number, since 4×18088398⁴ (a number of 30 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 502438 + ... + 502473.

It is an arithmetic number, because the mean of its divisors is an integer number (3265964).

Almost surely, 2^18088398 is an apocalyptic number.

18088398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18088398 is an abundant number, since it is smaller than the sum of its proper divisors (21103170).

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

18088398 is a wasteful number, since it uses less digits than its factorization.

18088398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004919 (or 1004916 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 18088398 is about 4253.0457321783. The cubic root of 18088398 is about 262.5024543988.

The spelling of 18088398 in words is "eighteen million, eighty-eight thousand, three hundred ninety-eight".