18090777 has 4 divisors (see below), whose sum is σ = 24121040. Its totient is φ = 12060516.

The previous prime is 18090773. The next prime is 18090797. The reversal of 18090777 is 77709081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77709081 = 3 ⋅25903027.

It is not a de Polignac number, because 18090777 - 2² = 18090773 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 3015127 + ... + 3015132.

It is an arithmetic number, because the mean of its divisors is an integer number (6030260).

Almost surely, 2^18090777 is an apocalyptic number.

It is an amenable number.

18090777 is a deficient number, since it is larger than the sum of its proper divisors (6030263).

18090777 is an equidigital number, since it uses as much as digits as its factorization.

18090777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6030262.

The product of its (nonzero) digits is 24696, while the sum is 39.

The square root of 18090777 is about 4253.3254049038. The cubic root of 18090777 is about 262.5139620692.

Subtracting from 18090777 its product of nonzero digits (24696), we obtain a palindrome (18066081).

The spelling of 18090777 in words is "eighteen million, ninety thousand, seven hundred seventy-seven".