1218785234 has 8 divisors (see below), whose sum is σ = 1834684668. Its totient is φ = 607223680.

The previous prime is 1218785209. The next prime is 1218785237. The reversal of 1218785234 is 4325878121.

It can be written as a sum of positive squares in 2 ways, for example, as 1122451009 + 96334225 = 33503^2 + 9815^2 .

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

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1218785191 and 1218785200.

It is not an unprimeable number, because it can be changed into a prime (1218785237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1083767 + ... + 1084890.

Almost surely, 2^1218785234 is an apocalyptic number.

1218785234 is a deficient number, since it is larger than the sum of its proper divisors (615899434).

1218785234 is a wasteful number, since it uses less digits than its factorization.

1218785234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168940.

The product of its digits is 107520, while the sum is 41.

The square root of 1218785234 is about 34911.1047376046. The cubic root of 1218785234 is about 1068.1749638539.

The spelling of 1218785234 in words is "one billion, two hundred eighteen million, seven hundred eighty-five thousand, two hundred thirty-four".