18106439 has 4 divisors (see below), whose sum is σ = 19499256. Its totient is φ = 16713624.

The previous prime is 18106423. The next prime is 18106453. The reversal of 18106439 is 93460181.

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: 93460181 = 409 ⋅228509.

It is a cyclic number.

It is not a de Polignac number, because 18106439 - 2⁴ = 18106423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18106489) 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, 696389 + ... + 696414.

It is an arithmetic number, because the mean of its divisors is an integer number (4874814).

Almost surely, 2^18106439 is an apocalyptic number.

18106439 is a deficient number, since it is larger than the sum of its proper divisors (1392817).

18106439 is a wasteful number, since it uses less digits than its factorization.

18106439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392816.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18106439 is about 4255.1661542177. The cubic root of 18106439 is about 262.5896969356.

The spelling of 18106439 in words is "eighteen million, one hundred six thousand, four hundred thirty-nine".