18090776 has 32 divisors (see below), whose sum is σ = 37255680. Its totient is φ = 8167200.

The previous prime is 18090773. The next prime is 18090797. The reversal of 18090776 is 67709081.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 14081 + ... + 15311.

It is an arithmetic number, because the mean of its divisors is an integer number (1164240).

Almost surely, 2^18090776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18090776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18627840).

18090776 is an abundant number, since it is smaller than the sum of its proper divisors (19164904).

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

18090776 is a wasteful number, since it uses less digits than its factorization.

18090776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415 (or 1411 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 18090776 is about 4253.3252873487. The cubic root of 18090776 is about 262.5139572322.

The spelling of 18090776 in words is "eighteen million, ninety thousand, seven hundred seventy-six".