18140129 has 4 divisors (see below), whose sum is σ = 20731584. Its totient is φ = 15548676.

The previous prime is 18140113. The next prime is 18140131. The reversal of 18140129 is 92104181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18140129 - 2⁴ = 18140113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18140098 and 18140107.

It is not an unprimeable number, because it can be changed into a prime (18140159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295717 + ... + 1295730.

It is an arithmetic number, because the mean of its divisors is an integer number (5182896).

Almost surely, 2^18140129 is an apocalyptic number.

It is an amenable number.

18140129 is a deficient number, since it is larger than the sum of its proper divisors (2591455).

18140129 is an equidigital number, since it uses as much as digits as its factorization.

18140129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591454.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18140129 is about 4259.1230317989. The cubic root of 18140129 is about 262.7524597641.

The spelling of 18140129 in words is "eighteen million, one hundred forty thousand, one hundred twenty-nine".