18421829 has 8 divisors (see below), whose sum is σ = 19554048. Its totient is φ = 17295040.

The previous prime is 18421813. The next prime is 18421841. The reversal of 18421829 is 92812481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18421829 - 2⁴ = 18421813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7244 + ... + 9450.

It is an arithmetic number, because the mean of its divisors is an integer number (2444256).

Almost surely, 2^18421829 is an apocalyptic number.

It is an amenable number.

18421829 is a deficient number, since it is larger than the sum of its proper divisors (1132219).

18421829 is a wasteful number, since it uses less digits than its factorization.

18421829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715.

The product of its digits is 9216, while the sum is 35.

The square root of 18421829 is about 4292.0658196258. The cubic root of 18421829 is about 264.1055831505.

The spelling of 18421829 in words is "eighteen million, four hundred twenty-one thousand, eight hundred twenty-nine".