1219987198 has 4 divisors (see below), whose sum is σ = 1829980800. Its totient is φ = 609993598.

The previous prime is 1219987193. The next prime is 1219987213. The reversal of 1219987198 is 8917899121.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219987193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304996798 + ... + 304996801.

It is an arithmetic number, because the mean of its divisors is an integer number (457495200).

Almost surely, 2^1219987198 is an apocalyptic number.

1219987198 is a deficient number, since it is larger than the sum of its proper divisors (609993602).

1219987198 is an equidigital number, since it uses as much as digits as its factorization.

1219987198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609993601.

The product of its digits is 653184, while the sum is 55.

The square root of 1219987198 is about 34928.3151325683. The cubic root of 1219987198 is about 1068.5259926173.

The spelling of 1219987198 in words is "one billion, two hundred nineteen million, nine hundred eighty-seven thousand, one hundred ninety-eight".