18620998 has 16 divisors (see below), whose sum is σ = 30537360. Its totient is φ = 8445600.

The previous prime is 18620989. The next prime is 18620999. The reversal of 18620998 is 89902681.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18620999) 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, 17728 + ... + 18748.

It is an arithmetic number, because the mean of its divisors is an integer number (1908585).

Almost surely, 2^18620998 is an apocalyptic number.

18620998 is a deficient number, since it is larger than the sum of its proper divisors (11916362).

18620998 is a wasteful number, since it uses less digits than its factorization.

18620998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863.

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

The square root of 18620998 is about 4315.2054412276. The cubic root of 18620998 is about 265.0539726307.

The spelling of 18620998 in words is "eighteen million, six hundred twenty thousand, nine hundred ninety-eight".