1221393966 has 32 divisors (see below), whose sum is σ = 2632227360. Its totient is φ = 375594624.

The previous prime is 1221393959. The next prime is 1221393991. The reversal of 1221393966 is 6693931221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175440 + ... + 182268.

It is an arithmetic number, because the mean of its divisors is an integer number (82257105).

Almost surely, 2^1221393966 is an apocalyptic number.

1221393966 is an abundant number, since it is smaller than the sum of its proper divisors (1410833394).

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

1221393966 is a wasteful number, since it uses less digits than its factorization.

1221393966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9140.

The product of its digits is 104976, while the sum is 42.

The square root of 1221393966 is about 34948.4472616453. The cubic root of 1221393966 is about 1068.9365408531.

The spelling of 1221393966 in words is "one billion, two hundred twenty-one million, three hundred ninety-three thousand, nine hundred sixty-six".