18955129 has 4 divisors (see below), whose sum is σ = 18965376. Its totient is φ = 18944884.

The previous prime is 18955127. The next prime is 18955163. The reversal of 18955129 is 92155981.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18955129 - 2¹ = 18955127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18955091 and 18955100.

It is not an unprimeable number, because it can be changed into a prime (18955127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1489 + ... + 6334.

It is an arithmetic number, because the mean of its divisors is an integer number (4741344).

Almost surely, 2^18955129 is an apocalyptic number.

It is an amenable number.

18955129 is a deficient number, since it is larger than the sum of its proper divisors (10247).

18955129 is an equidigital number, since it uses as much as digits as its factorization.

18955129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10246.

The product of its digits is 32400, while the sum is 40.

The square root of 18955129 is about 4353.7488443869. The cubic root of 18955129 is about 266.6299399073.

The spelling of 18955129 in words is "eighteen million, nine hundred fifty-five thousand, one hundred twenty-nine".