18390229 has 8 divisors (see below), whose sum is σ = 21605472. Its totient is φ = 15432240.

The previous prime is 18390199. The next prime is 18390257. The reversal of 18390229 is 92209381.

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 18390229 - 2⁷ = 18390101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18390194 and 18390203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390289) 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, 64159 + ... + 64444.

It is an arithmetic number, because the mean of its divisors is an integer number (2700684).

Almost surely, 2^18390229 is an apocalyptic number.

It is an amenable number.

18390229 is a deficient number, since it is larger than the sum of its proper divisors (3215243).

18390229 is a wasteful number, since it uses less digits than its factorization.

18390229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128627.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 18390229 is about 4288.3830286018. The cubic root of 18390229 is about 263.9544849985.

The spelling of 18390229 in words is "eighteen million, three hundred ninety thousand, two hundred twenty-nine".