18090523 has 4 divisors (see below), whose sum is σ = 19735128. Its totient is φ = 16445920.

The previous prime is 18090517. The next prime is 18090529. The reversal of 18090523 is 32509081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32509081 = 11 ⋅2955371.

It is an interprime number because it is at equal distance from previous prime (18090517) and next prime (18090529).

It is a cyclic number.

It is not a de Polignac number, because 18090523 - 2⁵ = 18090491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18090491 and 18090500.

It is not an unprimeable number, because it can be changed into a prime (18090529) 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, 822286 + ... + 822307.

It is an arithmetic number, because the mean of its divisors is an integer number (4933782).

Almost surely, 2^18090523 is an apocalyptic number.

18090523 is a deficient number, since it is larger than the sum of its proper divisors (1644605).

18090523 is a wasteful number, since it uses less digits than its factorization.

18090523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644604.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 18090523 is about 4253.2955458092. The cubic root of 18090523 is about 262.5127334715.

The spelling of 18090523 in words is "eighteen million, ninety thousand, five hundred twenty-three".