18938107 has 2 divisors, whose sum is σ = 18938108. Its totient is φ = 18938106.

The previous prime is 18938093. The next prime is 18938123. The reversal of 18938107 is 70183981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18938107 - 2⁷ = 18937979 is a prime.

It is a Chen prime.

It is a nialpdrome in base 11.

It is not a weakly prime, because it can be changed into another prime (18938147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9469053 + 9469054.

It is an arithmetic number, because the mean of its divisors is an integer number (9469054).

Almost surely, 2^18938107 is an apocalyptic number.

18938107 is a deficient number, since it is larger than the sum of its proper divisors (1).

18938107 is an equidigital number, since it uses as much as digits as its factorization.

18938107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 18938107 is about 4351.7935383012. The cubic root of 18938107 is about 266.5501033965.

It can be divided in two parts, 1893 and 8107, that added together give a 4-th power (10000 = 10⁴).

The spelling of 18938107 in words is "eighteen million, nine hundred thirty-eight thousand, one hundred seven".