1218121896 has 32 divisors (see below), whose sum is σ = 3102766560. Its totient is φ = 398379072.

The previous prime is 1218121813. The next prime is 1218121943. The reversal of 1218121896 is 6981218121.

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

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 477550 + ... + 480093.

It is an arithmetic number, because the mean of its divisors is an integer number (96961455).

Almost surely, 2^1218121896 is an apocalyptic number.

It is an amenable number.

1218121896 is an abundant number, since it is smaller than the sum of its proper divisors (1884644664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218121896 is a wasteful number, since it uses less digits than its factorization.

1218121896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957705 (or 957701 counting only the distinct ones).

The product of its digits is 13824, while the sum is 39.

The square root of 1218121896 is about 34901.6030577393. The cubic root of 1218121896 is about 1067.9811398148.

The spelling of 1218121896 in words is "one billion, two hundred eighteen million, one hundred twenty-one thousand, eight hundred ninety-six".