18939043 has 2 divisors, whose sum is σ = 18939044. Its totient is φ = 18939042.

The previous prime is 18939031. The next prime is 18939061. The reversal of 18939043 is 34093981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18939043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18938993 and 18939011.

It is not a weakly prime, because it can be changed into another prime (18939013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9469521 + 9469522.

It is an arithmetic number, because the mean of its divisors is an integer number (9469522).

Almost surely, 2^18939043 is an apocalyptic number.

18939043 is a deficient number, since it is larger than the sum of its proper divisors (1).

18939043 is an equidigital number, since it uses as much as digits as its factorization.

18939043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 18939043 is about 4351.9010788390. The cubic root of 18939043 is about 266.5544946623.

The spelling of 18939043 in words is "eighteen million, nine hundred thirty-nine thousand, forty-three".