18390294 has 128 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 5018112.

The previous prime is 18390289. The next prime is 18390299. The reversal of 18390294 is 49209381.

It is an interprime number because it is at equal distance from previous prime (18390289) and next prime (18390299).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 274449 + ... + 274515.

It is an arithmetic number, because the mean of its divisors is an integer number (385560).

Almost surely, 2^18390294 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18390294, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24675840).

18390294 is an abundant number, since it is smaller than the sum of its proper divisors (30961386).

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

18390294 is a wasteful number, since it uses less digits than its factorization.

18390294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 18390294 is about 4288.3906072092. The cubic root of 18390294 is about 263.9547959793.

The spelling of 18390294 in words is "eighteen million, three hundred ninety thousand, two hundred ninety-four".