18229999 has 2 divisors, whose sum is σ = 18230000. Its totient is φ = 18229998.

The previous prime is 18229973. The next prime is 18230029. The reversal of 18229999 is 99992281.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18229999 is a prime.

18229999 is a modest number, since divided by 9999 gives 1822 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18229919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114999 + 9115000.

It is an arithmetic number, because the mean of its divisors is an integer number (9115000).

Almost surely, 2^18229999 is an apocalyptic number.

18229999 is a deficient number, since it is larger than the sum of its proper divisors (1).

18229999 is an equidigital number, since it uses as much as digits as its factorization.

18229999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 49.

The square root of 18229999 is about 4269.6602909365. The cubic root of 18229999 is about 263.1856554160.

The spelling of 18229999 in words is "eighteen million, two hundred twenty-nine thousand, nine hundred ninety-nine".