18999929 has 8 divisors (see below), whose sum is σ = 20742792. Its totient is φ = 17297280.

The previous prime is 18999919. The next prime is 18999971. The reversal of 18999929 is 92999981.

It can be written as a sum of positive squares in 4 ways, for example, as 60025 + 18939904 = 245^2 + 4352^2 .

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

It is not a de Polignac number, because 18999929 - 2⁴ = 18999913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18999919) by changing a digit.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9062 + ... + 10959.

It is an arithmetic number, because the mean of its divisors is an integer number (2592849).

Almost surely, 2^18999929 is an apocalyptic number.

It is an amenable number.

18999929 is a deficient number, since it is larger than the sum of its proper divisors (1742863).

18999929 is a wasteful number, since it uses less digits than its factorization.

18999929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20107.

The product of its digits is 944784, while the sum is 56.

The square root of 18999929 is about 4358.8907992745. The cubic root of 18999929 is about 266.8398324919.

The spelling of 18999929 in words is "eighteen million, nine hundred ninety-nine thousand, nine hundred twenty-nine".