18442939 has 8 divisors (see below), whose sum is σ = 19681040. Its totient is φ = 17231616.

The previous prime is 18442891. The next prime is 18442967. The reversal of 18442939 is 93924481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18442939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18442969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5262 + ... + 8035.

It is an arithmetic number, because the mean of its divisors is an integer number (2460130).

Almost surely, 2^18442939 is an apocalyptic number.

18442939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18442939 is a deficient number, since it is larger than the sum of its proper divisors (1238101).

18442939 is a wasteful number, since it uses less digits than its factorization.

18442939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13389.

The product of its digits is 62208, while the sum is 40.

The square root of 18442939 is about 4294.5243042740. The cubic root of 18442939 is about 264.2064262065.

The spelling of 18442939 in words is "eighteen million, four hundred forty-two thousand, nine hundred thirty-nine".