18340398 has 16 divisors (see below), whose sum is σ = 40756560. Its totient is φ = 6113448.

The previous prime is 18340397. The next prime is 18340409. The reversal of 18340398 is 89304381.

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (18340391) 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, 169765 + ... + 169872.

It is an arithmetic number, because the mean of its divisors is an integer number (2547285).

Almost surely, 2^18340398 is an apocalyptic number.

18340398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18340398 is an abundant number, since it is smaller than the sum of its proper divisors (22416162).

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

18340398 is a wasteful number, since it uses less digits than its factorization.

18340398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339648 (or 339642 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 18340398 is about 4282.5690887597. The cubic root of 18340398 is about 263.7158616522.

The spelling of 18340398 in words is "eighteen million, three hundred forty thousand, three hundred ninety-eight".