18140929 has 2 divisors, whose sum is σ = 18140930. Its totient is φ = 18140928.

The previous prime is 18140923. The next prime is 18140939. The reversal of 18140929 is 92904181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9290304 + 8850625 = 3048^2 + 2975^2 .

It is an emirp because it is prime and its reverse (92904181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18140929 - 2⁵ = 18140897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18140894 and 18140903.

It is not a weakly prime, because it can be changed into another prime (18140923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9070464 + 9070465.

It is an arithmetic number, because the mean of its divisors is an integer number (9070465).

Almost surely, 2^18140929 is an apocalyptic number.

It is an amenable number.

18140929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18140929 is an equidigital number, since it uses as much as digits as its factorization.

18140929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 18140929 is about 4259.2169468108. The cubic root of 18140929 is about 262.7563222666.

The spelling of 18140929 in words is "eighteen million, one hundred forty thousand, nine hundred twenty-nine".