18700229 has 4 divisors (see below), whose sum is σ = 18794400. Its totient is φ = 18606060.

The previous prime is 18700217. The next prime is 18700243. The reversal of 18700229 is 92200781.

It is a happy number.

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 18700229 - 2⁸ = 18699973 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 (18700249) 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, 46787 + ... + 47184.

It is an arithmetic number, because the mean of its divisors is an integer number (4698600).

Almost surely, 2^18700229 is an apocalyptic number.

It is an amenable number.

18700229 is a deficient number, since it is larger than the sum of its proper divisors (94171).

18700229 is an equidigital number, since it uses as much as digits as its factorization.

18700229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94170.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18700229 is about 4324.3761399767. The cubic root of 18700229 is about 265.4293692004.

The spelling of 18700229 in words is "eighteen million, seven hundred thousand, two hundred twenty-nine".