18140688 has 60 divisors (see below), whose sum is σ = 51068160. Its totient is φ = 6011328.

The previous prime is 18140677. The next prime is 18140701. The reversal of 18140688 is 88604181.

It is a super-2 number, since 2×18140688² = 658169122226688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37633 + ... + 38111.

It is an arithmetic number, because the mean of its divisors is an integer number (851136).

Almost surely, 2^18140688 is an apocalyptic number.

18140688 is a gapful number since it is divisible by the number (18) 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 18140688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25534080).

18140688 is an abundant number, since it is smaller than the sum of its proper divisors (32927472).

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

18140688 is a wasteful number, since it uses less digits than its factorization.

18140688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 18140688 is about 4259.1886551314. The cubic root of 18140688 is about 262.7551586996.

The spelling of 18140688 in words is "eighteen million, one hundred forty thousand, six hundred eighty-eight".