1218796198 has 32 divisors (see below), whose sum is σ = 1990407168. Its totient is φ = 557520000.

The previous prime is 1218796177. The next prime is 1218796199. The reversal of 1218796198 is 8916978121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218796199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238773 + ... + 243823.

It is an arithmetic number, because the mean of its divisors is an integer number (62200224).

Almost surely, 2^1218796198 is an apocalyptic number.

1218796198 is a deficient number, since it is larger than the sum of its proper divisors (771610970).

1218796198 is a wasteful number, since it uses less digits than its factorization.

1218796198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5268.

The product of its digits is 435456, while the sum is 52.

The square root of 1218796198 is about 34911.2617646512. The cubic root of 1218796198 is about 1068.1781668889.

The spelling of 1218796198 in words is "one billion, two hundred eighteen million, seven hundred ninety-six thousand, one hundred ninety-eight".