18098639 has 16 divisors (see below), whose sum is σ = 20519520. Its totient is φ = 15845760.

The previous prime is 18098627. The next prime is 18098651. The reversal of 18098639 is 93689081.

It is an interprime number because it is at equal distance from previous prime (18098627) and next prime (18098651).

It is a cyclic number.

It is not a de Polignac number, because 18098639 - 2⁴ = 18098623 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18098639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18098609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22604 + ... + 23390.

It is an arithmetic number, because the mean of its divisors is an integer number (1282470).

Almost surely, 2^18098639 is an apocalyptic number.

18098639 is a deficient number, since it is larger than the sum of its proper divisors (2420881).

18098639 is a wasteful number, since it uses less digits than its factorization.

18098639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18098639 is about 4254.2495225363. The cubic root of 18098639 is about 262.5519848669.

The spelling of 18098639 in words is "eighteen million, ninety-eight thousand, six hundred thirty-nine".