18138590 has 16 divisors (see below), whose sum is σ = 32974560. Its totient is φ = 7183200.

The previous prime is 18138587. The next prime is 18138599. The reversal of 18138590 is 9583181.

It is a self number, because there is not a number n which added to its sum of digits gives 18138590.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7970 + ... + 9989.

It is an arithmetic number, because the mean of its divisors is an integer number (2060910).

Almost surely, 2^18138590 is an apocalyptic number.

18138590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18138590 is a deficient number, since it is larger than the sum of its proper divisors (14835970).

18138590 is a wasteful number, since it uses less digits than its factorization.

18138590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18067.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 18138590 is about 4258.9423569708. The cubic root of 18138590 is about 262.7450289557.

The spelling of 18138590 in words is "eighteen million, one hundred thirty-eight thousand, five hundred ninety".