18206998 has 4 divisors (see below), whose sum is σ = 27310500. Its totient is φ = 9103498.

The previous prime is 18206977. The next prime is 18206999. The reversal of 18206998 is 89960281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18206999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4551748 + ... + 4551751.

It is an arithmetic number, because the mean of its divisors is an integer number (6827625).

Almost surely, 2^18206998 is an apocalyptic number.

18206998 is a deficient number, since it is larger than the sum of its proper divisors (9103502).

18206998 is an equidigital number, since it uses as much as digits as its factorization.

18206998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9103501.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 18206998 is about 4266.9659009652. The cubic root of 18206998 is about 263.0749207055.

The spelling of 18206998 in words is "eighteen million, two hundred six thousand, nine hundred ninety-eight".