18890398 has 8 divisors (see below), whose sum is σ = 28359000. Its totient is φ = 9437400.

The previous prime is 18890371. The next prime is 18890411. The reversal of 18890398 is 89309881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153 + ... + 6148.

It is an arithmetic number, because the mean of its divisors is an integer number (3544875).

Almost surely, 2^18890398 is an apocalyptic number.

18890398 is a deficient number, since it is larger than the sum of its proper divisors (9468602).

18890398 is a wasteful number, since it uses less digits than its factorization.

18890398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7802.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 18890398 is about 4346.3085486422. The cubic root of 18890398 is about 266.3260835999.

The spelling of 18890398 in words is "eighteen million, eight hundred ninety thousand, three hundred ninety-eight".