18321039 has 16 divisors (see below), whose sum is σ = 29610240. Its totient is φ = 11103480.

The previous prime is 18321013. The next prime is 18321059. The reversal of 18321039 is 93012381.

It is not a de Polignac number, because 18321039 - 2¹¹ = 18318991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18321059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30547 + ... + 31140.

It is an arithmetic number, because the mean of its divisors is an integer number (1850640).

Almost surely, 2^18321039 is an apocalyptic number.

18321039 is a deficient number, since it is larger than the sum of its proper divisors (11289201).

18321039 is a wasteful number, since it uses less digits than its factorization.

18321039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61707 (or 61701 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 18321039 is about 4280.3082832899. The cubic root of 18321039 is about 263.6230415529.

The spelling of 18321039 in words is "eighteen million, three hundred twenty-one thousand, thirty-nine".