18430039 has 4 divisors (see below), whose sum is σ = 18462024. Its totient is φ = 18398056.

The previous prime is 18430037. The next prime is 18430043. The reversal of 18430039 is 93003481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93003481 = 17 ⋅5470793.

It is a cyclic number.

It is not a de Polignac number, because 18430039 - 2¹ = 18430037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18429989 and 18430016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18430037) 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, 15112 + ... + 16285.

It is an arithmetic number, because the mean of its divisors is an integer number (4615506).

Almost surely, 2^18430039 is an apocalyptic number.

18430039 is a deficient number, since it is larger than the sum of its proper divisors (31985).

18430039 is an equidigital number, since it uses as much as digits as its factorization.

18430039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31984.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 18430039 is about 4293.0221289903. The cubic root of 18430039 is about 264.1448116983.

The spelling of 18430039 in words is "eighteen million, four hundred thirty thousand, thirty-nine".