18436039 has 4 divisors (see below), whose sum is σ = 18553624. Its totient is φ = 18318456.

The previous prime is 18436031. The next prime is 18436051. The reversal of 18436039 is 93063481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18436039 - 2³ = 18436031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18435995 and 18436013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18436031) 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, 58557 + ... + 58870.

It is an arithmetic number, because the mean of its divisors is an integer number (4638406).

Almost surely, 2^18436039 is an apocalyptic number.

18436039 is a deficient number, since it is larger than the sum of its proper divisors (117585).

18436039 is a wasteful number, since it uses less digits than its factorization.

18436039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117584.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 18436039 is about 4293.7208805417. The cubic root of 18436039 is about 264.1734731843.

The spelling of 18436039 in words is "eighteen million, four hundred thirty-six thousand, thirty-nine".