1218217234 has 24 divisors (see below), whose sum is σ = 1985616612. Its totient is φ = 560289600.

The previous prime is 1218217223. The next prime is 1218217237. The reversal of 1218217234 is 4327128121.

It can be written as a sum of positive squares in 6 ways, for example, as 383180625 + 835036609 = 19575^2 + 28897^2 .

It is a super-2 number, since 2×1218217234² = 2968106458429221512, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1218217196 and 1218217205.

It is not an unprimeable number, because it can be changed into a prime (1218217237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92884 + ... + 105184.

Almost surely, 2^1218217234 is an apocalyptic number.

1218217234 is a deficient number, since it is larger than the sum of its proper divisors (767399378).

1218217234 is a wasteful number, since it uses less digits than its factorization.

1218217234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12622 (or 12609 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 1218217234 is about 34902.9688422060. The cubic root of 1218217234 is about 1068.0090014297.

The spelling of 1218217234 in words is "one billion, two hundred eighteen million, two hundred seventeen thousand, two hundred thirty-four".