18090774 has 72 divisors (see below), whose sum is σ = 44820360. Its totient is φ = 5256576.

The previous prime is 18090773. The next prime is 18090797. The reversal of 18090774 is 47709081.

It is a super-2 number, since 2×18090774² = 654552207838152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18090773) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 57642 + ... + 57954.

It is an arithmetic number, because the mean of its divisors is an integer number (622505).

Almost surely, 2^18090774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18090774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22410180).

18090774 is an abundant number, since it is smaller than the sum of its proper divisors (26729586).

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

18090774 is a wasteful number, since it uses less digits than its factorization.

18090774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 18090774 is about 4253.3250522385. The cubic root of 18090774 is about 262.5139475582.

It can be divided in two parts, 1809077 and 4, that added together give a palindrome (1809081).

The spelling of 18090774 in words is "eighteen million, ninety thousand, seven hundred seventy-four".