18959998 has 16 divisors (see below), whose sum is σ = 30529440. Its totient is φ = 8798976.

The previous prime is 18959987. The next prime is 18960031. The reversal of 18959998 is 89995981.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1338 + ... + 6301.

It is an arithmetic number, because the mean of its divisors is an integer number (1908090).

Almost surely, 2^18959998 is an apocalyptic number.

18959998 is a deficient number, since it is larger than the sum of its proper divisors (11569442).

18959998 is a wasteful number, since it uses less digits than its factorization.

18959998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7731.

The product of its digits is 2099520, while the sum is 58.

The square root of 18959998 is about 4354.3079817578. The cubic root of 18959998 is about 266.6527676784.

The spelling of 18959998 in words is "eighteen million, nine hundred fifty-nine thousand, nine hundred ninety-eight".