18090807 has 16 divisors (see below), whose sum is σ = 27651840. Its totient is φ = 10305792.

The previous prime is 18090797. The next prime is 18090827. The reversal of 18090807 is 70809081.

It is not a de Polignac number, because 18090807 - 2⁸ = 18090551 is a prime.

It is a super-2 number, since 2×18090807² = 654554595822498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18090827) 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 15 ways as a sum of consecutive naturals, for example, 6823 + ... + 9095.

It is an arithmetic number, because the mean of its divisors is an integer number (1728240).

Almost surely, 2^18090807 is an apocalyptic number.

18090807 is a deficient number, since it is larger than the sum of its proper divisors (9561033).

18090807 is a wasteful number, since it uses less digits than its factorization.

18090807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 18090807 is about 4253.3289315547. The cubic root of 18090807 is about 262.5141071784.

Adding to 18090807 its reverse (70809081), we get a palindrome (88899888).

The spelling of 18090807 in words is "eighteen million, ninety thousand, eight hundred seven".