1218428836 has 27 divisors (see below), whose sum is σ = 2207171883. Its totient is φ = 588515160.

The previous prime is 1218428803. The next prime is 1218428851. The reversal of 1218428836 is 6388248121.

It is a happy number.

The square root of 1218428836 is 34906.

It is a perfect power (a square), and thus also a powerful number.

It is a junction number, because it is equal to n+sod(n) for n = 1218428792 and 1218428801.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2163891 + ... + 2164453.

Almost surely, 2^1218428836 is an apocalyptic number.

1218428836 is the 34906-th square number.

It is an amenable number.

1218428836 is a deficient number, since it is larger than the sum of its proper divisors (988743047).

1218428836 is an frugal number, since it uses more digits than its factorization.

1218428836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 596 counting only the distinct ones).

The product of its digits is 147456, while the sum is 43.

The cubic root of 1218428836 is about 1068.0708348890.

Multiplying 1218428836 by its product of digits (147456), we get a square (179664642441216 = 13403904²).

The spelling of 1218428836 in words is "one billion, two hundred eighteen million, four hundred twenty-eight thousand, eight hundred thirty-six".