198399518 has 8 divisors (see below), whose sum is σ = 310538448. Its totient is φ = 94886704.

The previous prime is 198399491. The next prime is 198399521. The reversal of 198399518 is 815993891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 198399518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2156471 + ... + 2156562.

It is an arithmetic number, because the mean of its divisors is an integer number (38817306).

Almost surely, 2^198399518 is an apocalyptic number.

198399518 is a deficient number, since it is larger than the sum of its proper divisors (112138930).

198399518 is a wasteful number, since it uses less digits than its factorization.

198399518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313058.

The product of its digits is 699840, while the sum is 53.

The square root of 198399518 is about 14085.4363794666. The cubic root of 198399518 is about 583.2394220157.

The spelling of 198399518 in words is "one hundred ninety-eight million, three hundred ninety-nine thousand, five hundred eighteen".