1220723984 has 60 divisors (see below), whose sum is σ = 2439997476. Its totient is φ = 591591936.

The previous prime is 1220723969. The next prime is 1220724007. The reversal of 1220723984 is 4893270221.

It can be written as a sum of positive squares in 6 ways, for example, as 153264400 + 1067459584 = 12380^2 + 32672^2 .

It is a super-2 number, since 2×1220723984² = 2980334090225664512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7056122 + ... + 7056294.

Almost surely, 2^1220723984 is an apocalyptic number.

It is an amenable number.

1220723984 is a deficient number, since it is larger than the sum of its proper divisors (1219273492).

1220723984 is a wasteful number, since it uses less digits than its factorization.

1220723984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 1220723984 is about 34938.8606568674. The cubic root of 1220723984 is about 1068.7410540432.

The spelling of 1220723984 in words is "one billion, two hundred twenty million, seven hundred twenty-three thousand, nine hundred eighty-four".