18218998 has 16 divisors (see below), whose sum is σ = 31610880. Its totient is φ = 7713576.

The previous prime is 18218983. The next prime is 18219001. The reversal of 18218998 is 89981281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6678 + ... + 9001.

It is an arithmetic number, because the mean of its divisors is an integer number (1975680).

Almost surely, 2^18218998 is an apocalyptic number.

18218998 is a deficient number, since it is larger than the sum of its proper divisors (13391882).

18218998 is a wasteful number, since it uses less digits than its factorization.

18218998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15771.

The product of its digits is 82944, while the sum is 46.

The square root of 18218998 is about 4268.3718207298. The cubic root of 18218998 is about 263.1327044533.

The spelling of 18218998 in words is "eighteen million, two hundred eighteen thousand, nine hundred ninety-eight".