18999829 has 16 divisors (see below), whose sum is σ = 21556800. Its totient is φ = 16637184.

The previous prime is 18999821. The next prime is 18999839. The reversal of 18999829 is 92899981.

It is a cyclic number.

It is not a de Polignac number, because 18999829 - 2³ = 18999821 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 18999829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18999821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18559 + ... + 19555.

It is an arithmetic number, because the mean of its divisors is an integer number (1347300).

Almost surely, 2^18999829 is an apocalyptic number.

18999829 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18999829 is a deficient number, since it is larger than the sum of its proper divisors (2556971).

18999829 is a wasteful number, since it uses less digits than its factorization.

18999829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its digits is 839808, while the sum is 55.

The square root of 18999829 is about 4358.8793284513. The cubic root of 18999829 is about 266.8393643493.

The spelling of 18999829 in words is "eighteen million, nine hundred ninety-nine thousand, eight hundred twenty-nine".