18722929 has 3 divisors (see below), whose sum is σ = 18727257. Its totient is φ = 18718602.

The previous prime is 18722909. The next prime is 18722941. The reversal of 18722929 is 92922781.

The square root of 18722929 is 4327.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 18722929 - 2¹¹ = 18720881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18722891 and 18722900.

It is not an unprimeable number, because it can be changed into a prime (18722909) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2164 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (6242419).

Almost surely, 2^18722929 is an apocalyptic number.

18722929 is the 4327-th square number.

18722929 is the 2164-th centered octagonal number.

It is an amenable number.

18722929 is a deficient number, since it is larger than the sum of its proper divisors (4328).

18722929 is an frugal number, since it uses more digits than its factorization.

18722929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8654 (or 4327 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The cubic root of 18722929 is about 265.5367263587.

The spelling of 18722929 in words is "eighteen million, seven hundred twenty-two thousand, nine hundred twenty-nine".