1216988194 has 8 divisors (see below), whose sum is σ = 1837734300. Its totient is φ = 604410096.

The previous prime is 1216988177. The next prime is 1216988203. The reversal of 1216988194 is 4918896121.

It can be written as a sum of positive squares in 2 ways, for example, as 1207910025 + 9078169 = 34755^2 + 3013^2 .

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

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, 2041629 + ... + 2042224.

Almost surely, 2^1216988194 is an apocalyptic number.

1216988194 is a deficient number, since it is larger than the sum of its proper divisors (620746106).

1216988194 is a wasteful number, since it uses less digits than its factorization.

1216988194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4084004.

The product of its digits is 248832, while the sum is 49.

The square root of 1216988194 is about 34885.3578740422. The cubic root of 1216988194 is about 1067.6497148091.

The spelling of 1216988194 in words is "one billion, two hundred sixteen million, nine hundred eighty-eight thousand, one hundred ninety-four".