18038623 has 4 divisors (see below), whose sum is σ = 18267040. Its totient is φ = 17810208.

The previous prime is 18038597. The next prime is 18038651. The reversal of 18038623 is 32683081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32683081 = 3307 ⋅9883.

It is a cyclic number.

It is not a de Polignac number, because 18038623 - 2⁵ = 18038591 is a prime.

It is a super-2 number, since 2×18038623² = 650783839472258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038663) 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, 114090 + ... + 114247.

It is an arithmetic number, because the mean of its divisors is an integer number (4566760).

Almost surely, 2^18038623 is an apocalyptic number.

18038623 is a deficient number, since it is larger than the sum of its proper divisors (228417).

18038623 is an equidigital number, since it uses as much as digits as its factorization.

18038623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228416.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 18038623 is about 4247.1900122316. The cubic root of 18038623 is about 262.2614516130.

The spelling of 18038623 in words is "eighteen million, thirty-eight thousand, six hundred twenty-three".