1221179418 has 24 divisors (see below), whose sum is σ = 2647970208. Its totient is φ = 406739592.

The previous prime is 1221179359. The next prime is 1221179423. The reversal of 1221179418 is 8149711221.

1221179418 is a `hidden beast` number, since 1 + 221 + 17 + 9 + 418 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2580 + ... + 49487.

It is an arithmetic number, because the mean of its divisors is an integer number (110332092).

Almost surely, 2^1221179418 is an apocalyptic number.

1221179418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1221179418 is an abundant number, since it is smaller than the sum of its proper divisors (1426790790).

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

1221179418 is a wasteful number, since it uses less digits than its factorization.

1221179418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53378 (or 53375 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1221179418 is about 34945.3776342451. The cubic root of 1221179418 is about 1068.8739479925.

The spelling of 1221179418 in words is "one billion, two hundred twenty-one million, one hundred seventy-nine thousand, four hundred eighteen".