18344039 has 4 divisors (see below), whose sum is σ = 20964624. Its totient is φ = 15723456.

The previous prime is 18344023. The next prime is 18344069. The reversal of 18344039 is 93044381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93044381 = 37 ⋅2514713.

It is not a de Polignac number, because 18344039 - 2⁴ = 18344023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18343996 and 18344014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18344069) 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, 1310282 + ... + 1310295.

It is an arithmetic number, because the mean of its divisors is an integer number (5241156).

Almost surely, 2^18344039 is an apocalyptic number.

18344039 is a deficient number, since it is larger than the sum of its proper divisors (2620585).

18344039 is an equidigital number, since it uses as much as digits as its factorization.

18344039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620584.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 18344039 is about 4282.9941629659. The cubic root of 18344039 is about 263.7333117628.

The spelling of 18344039 in words is "eighteen million, three hundred forty-four thousand, thirty-nine".