18542429 has 2 divisors, whose sum is σ = 18542430. Its totient is φ = 18542428.

The previous prime is 18542413. The next prime is 18542437. The reversal of 18542429 is 92424581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11546404 + 6996025 = 3398^2 + 2645^2 .

It is an emirp because it is prime and its reverse (92424581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18542429 - 2⁴ = 18542413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18542479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9271214 + 9271215.

It is an arithmetic number, because the mean of its divisors is an integer number (9271215).

Almost surely, 2^18542429 is an apocalyptic number.

It is an amenable number.

18542429 is a deficient number, since it is larger than the sum of its proper divisors (1).

18542429 is an equidigital number, since it uses as much as digits as its factorization.

18542429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 35.

The square root of 18542429 is about 4306.0920798329. The cubic root of 18542429 is about 264.6806595933.

The spelling of 18542429 in words is "eighteen million, five hundred forty-two thousand, four hundred twenty-nine".