18245939 has 4 divisors (see below), whose sum is σ = 18590256. Its totient is φ = 17901624.

The previous prime is 18245911. The next prime is 18245951. The reversal of 18245939 is 93954281.

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 18245939 - 2⁸ = 18245683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18245896 and 18245905.

It is not an unprimeable number, because it can be changed into a prime (18245999) 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, 172079 + ... + 172184.

It is an arithmetic number, because the mean of its divisors is an integer number (4647564).

Almost surely, 2^18245939 is an apocalyptic number.

18245939 is a deficient number, since it is larger than the sum of its proper divisors (344317).

18245939 is an equidigital number, since it uses as much as digits as its factorization.

18245939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344316.

The product of its digits is 77760, while the sum is 41.

The square root of 18245939 is about 4271.5265421158. The cubic root of 18245939 is about 263.2623414178.

The spelling of 18245939 in words is "eighteen million, two hundred forty-five thousand, nine hundred thirty-nine".