18729119 has 2 divisors, whose sum is σ = 18729120. Its totient is φ = 18729118.

The previous prime is 18729103. The next prime is 18729163. The reversal of 18729119 is 91192781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18729119 - 2⁴ = 18729103 is a prime.

It is a super-2 number, since 2×18729119² = 701559797032322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18729419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9364559 + 9364560.

It is an arithmetic number, because the mean of its divisors is an integer number (9364560).

Almost surely, 2^18729119 is an apocalyptic number.

18729119 is a deficient number, since it is larger than the sum of its proper divisors (1).

18729119 is an equidigital number, since it uses as much as digits as its factorization.

18729119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 38.

The square root of 18729119 is about 4327.7152170632. The cubic root of 18729119 is about 265.5659862256.

The spelling of 18729119 in words is "eighteen million, seven hundred twenty-nine thousand, one hundred nineteen".