18090782 has 4 divisors (see below), whose sum is σ = 27136176. Its totient is φ = 9045390.

The previous prime is 18090773. The next prime is 18090797. The reversal of 18090782 is 28709081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28709081 = 3727 ⋅7703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4522694 + ... + 4522697.

It is an arithmetic number, because the mean of its divisors is an integer number (6784044).

Almost surely, 2^18090782 is an apocalyptic number.

18090782 is a deficient number, since it is larger than the sum of its proper divisors (9045394).

18090782 is an equidigital number, since it uses as much as digits as its factorization.

18090782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9045393.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 18090782 is about 4253.3259926791. The cubic root of 18090782 is about 262.5139862540.

The spelling of 18090782 in words is "eighteen million, ninety thousand, seven hundred eighty-two".