1213997018 has 16 divisors (see below), whose sum is σ = 1962160200. Its totient is φ = 559995456.

The previous prime is 1213997011. The next prime is 1213997021. The reversal of 1213997018 is 8107993121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1138185169 + 75811849 = 33737^2 + 8707^2 .

It is not an unprimeable number, because it can be changed into a prime (1213997011) 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, 38696 + ... + 62652.

Almost surely, 2^1213997018 is an apocalyptic number.

1213997018 is a deficient number, since it is larger than the sum of its proper divisors (748163182).

1213997018 is a wasteful number, since it uses less digits than its factorization.

1213997018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25921.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 1213997018 is about 34842.4599877793. The cubic root of 1213997018 is about 1066.7742891193.

The spelling of 1213997018 in words is "one billion, two hundred thirteen million, nine hundred ninety-seven thousand, eighteen".