1221974724 has 24 divisors (see below), whose sum is σ = 2899602720. Its totient is φ = 400420864.

The previous prime is 1221974723. The next prime is 1221974729. The reversal of 1221974724 is 4274791221.

It is not an unprimeable number, because it can be changed into a prime (1221974723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 862269 + ... + 863684.

It is an arithmetic number, because the mean of its divisors is an integer number (120816780).

Almost surely, 2^1221974724 is an apocalyptic number.

It is an amenable number.

1221974724 is an abundant number, since it is smaller than the sum of its proper divisors (1677627996).

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

1221974724 is a wasteful number, since it uses less digits than its factorization.

1221974724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726019 (or 1726017 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 1221974724 is about 34956.7550553538. The cubic root of 1221974724 is about 1069.1059361227.

The spelling of 1221974724 in words is "one billion, two hundred twenty-one million, nine hundred seventy-four thousand, seven hundred twenty-four".