1220843786724 has 27 divisors (see below), whose sum is σ = 3086038552233. Its totient is φ = 406945719072.

The previous prime is 1220843786693. The next prime is 1220843786759. The reversal of 1220843786724 is 4276873480221.

The square root of 1220843786724 is 1104918.

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

1220843786724 is a `hidden beast` number, since 1 + 2 + 208 + 4 + 378 + 67 + 2 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 796824022500 + 424019764224 = 892650^2 + 651168^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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, 6537432 + ... + 6721584.

Almost surely, 2^{1220843786724} is an apocalyptic number.

1220843786724 is the 1104918-th square number.

It is an amenable number.

1220843786724 is an abundant number, since it is smaller than the sum of its proper divisors (1865194765509).

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

1220843786724 is an frugal number, since it uses more digits than its factorization.

1220843786724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368316 (or 184158 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 54.

The spelling of 1220843786724 in words is "one trillion, two hundred twenty billion, eight hundred forty-three million, seven hundred eighty-six thousand, seven hundred twenty-four".