18090337 has 4 divisors (see below), whose sum is σ = 19042480. Its totient is φ = 17138196.

The previous prime is 18090301. The next prime is 18090341. The reversal of 18090337 is 73309081.

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: 73309081 = 911 ⋅80471.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18090337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18090299 and 18090308.

It is not an unprimeable number, because it can be changed into a prime (18090367) 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, 476043 + ... + 476080.

It is an arithmetic number, because the mean of its divisors is an integer number (4760620).

Almost surely, 2^18090337 is an apocalyptic number.

It is an amenable number.

18090337 is a deficient number, since it is larger than the sum of its proper divisors (952143).

18090337 is an equidigital number, since it uses as much as digits as its factorization.

18090337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952142.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 18090337 is about 4253.2736803549. The cubic root of 18090337 is about 262.5118337825.

The spelling of 18090337 in words is "eighteen million, ninety thousand, three hundred thirty-seven".