18090690 has 16 divisors (see below), whose sum is σ = 43417728. Its totient is φ = 4824176.

The previous prime is 18090689. The next prime is 18090691. The reversal of 18090690 is 9609081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18090689) and next prime (18090691).

It is a super-2 number, since 2×18090690² = 654546129352200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18090691) 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, 301482 + ... + 301541.

It is an arithmetic number, because the mean of its divisors is an integer number (2713608).

Almost surely, 2^18090690 is an apocalyptic number.

18090690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18090690 is an abundant number, since it is smaller than the sum of its proper divisors (25327038).

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

18090690 is a wasteful number, since it uses less digits than its factorization.

18090690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603033.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 18090690 is about 4253.3151775997. The cubic root of 18090690 is about 262.5135412516.

The spelling of 18090690 in words is "eighteen million, ninety thousand, six hundred ninety".