18833939 has 2 divisors, whose sum is σ = 18833940. Its totient is φ = 18833938.

The previous prime is 18833929. The next prime is 18833951. The reversal of 18833939 is 93933881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18833939 - 2⁴ = 18833923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18833939.

It is not a weakly prime, because it can be changed into another prime (18833929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9416969 + 9416970.

It is an arithmetic number, because the mean of its divisors is an integer number (9416970).

Almost surely, 2^18833939 is an apocalyptic number.

18833939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18833939 is an equidigital number, since it uses as much as digits as its factorization.

18833939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 44.

The square root of 18833939 is about 4339.8086363341. The cubic root of 18833939 is about 266.0604899461.

The spelling of 18833939 in words is "eighteen million, eight hundred thirty-three thousand, nine hundred thirty-nine".