18390834 has 64 divisors (see below), whose sum is σ = 50964480. Its totient is φ = 4775760.

The previous prime is 18390833. The next prime is 18390851. The reversal of 18390834 is 43809381.

18390834 is nontrivially palindromic in base 12.

It is not an unprimeable number, because it can be changed into a prime (18390833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1947 + ... + 6369.

It is an arithmetic number, because the mean of its divisors is an integer number (796320).

Almost surely, 2^18390834 is an apocalyptic number.

18390834 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18390834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25482240).

18390834 is an abundant number, since it is smaller than the sum of its proper divisors (32573646).

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

18390834 is a wasteful number, since it uses less digits than its factorization.

18390834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4452 (or 4446 counting only the distinct ones).

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

The square root of 18390834 is about 4288.4535674296. The cubic root of 18390834 is about 263.9573794833.

The spelling of 18390834 in words is "eighteen million, three hundred ninety thousand, eight hundred thirty-four".