18973129 has 4 divisors (see below), whose sum is σ = 21683584. Its totient is φ = 16262676.

The previous prime is 18973093. The next prime is 18973151. The reversal of 18973129 is 92137981.

18973129 is nontrivially palindromic in base 11.

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 18973129 - 2¹⁹ = 18448841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18973091 and 18973100.

It is not an unprimeable number, because it can be changed into a prime (18973159) by changing a digit.

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, 1355217 + ... + 1355230.

It is an arithmetic number, because the mean of its divisors is an integer number (5420896).

Almost surely, 2^18973129 is an apocalyptic number.

It is an amenable number.

18973129 is a deficient number, since it is larger than the sum of its proper divisors (2710455).

18973129 is an equidigital number, since it uses as much as digits as its factorization.

18973129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2710454.

The product of its digits is 27216, while the sum is 40.

The square root of 18973129 is about 4355.8155378758. The cubic root of 18973129 is about 266.7143114522.

The spelling of 18973129 in words is "eighteen million, nine hundred seventy-three thousand, one hundred twenty-nine".