18398838 has 16 divisors (see below), whose sum is σ = 36965376. Its totient is φ = 6105000.

The previous prime is 18398837. The next prime is 18398843. The reversal of 18398838 is 83889381.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18398833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5538 + ... + 8213.

It is an arithmetic number, because the mean of its divisors is an integer number (2310336).

Almost surely, 2^18398838 is an apocalyptic number.

18398838 is an abundant number, since it is smaller than the sum of its proper divisors (18566538).

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

18398838 is a wasteful number, since it uses less digits than its factorization.

18398838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13979.

The product of its digits is 331776, while the sum is 48.

The square root of 18398838 is about 4289.3866694435. The cubic root of 18398838 is about 263.9956668251.

The spelling of 18398838 in words is "eighteen million, three hundred ninety-eight thousand, eight hundred thirty-eight".