18899129 has 4 divisors (see below), whose sum is σ = 19893840. Its totient is φ = 17904420.

The previous prime is 18899113. The next prime is 18899131. The reversal of 18899129 is 92199881.

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 18899129 - 2⁴ = 18899113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18899149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 497327 + ... + 497364.

It is an arithmetic number, because the mean of its divisors is an integer number (4973460).

Almost surely, 2^18899129 is an apocalyptic number.

18899129 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18899129 is a deficient number, since it is larger than the sum of its proper divisors (994711).

18899129 is an equidigital number, since it uses as much as digits as its factorization.

18899129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994710.

The product of its digits is 93312, while the sum is 47.

The square root of 18899129 is about 4347.3128481856. The cubic root of 18899129 is about 266.3671085849.

The spelling of 18899129 in words is "eighteen million, eight hundred ninety-nine thousand, one hundred twenty-nine".