1220384979 has 18 divisors (see below), whose sum is σ = 1923578748. Its totient is φ = 739416600.

The previous prime is 1220384929. The next prime is 1220384981. The reversal of 1220384979 is 9794830221.

1220384979 is a `hidden beast` number, since 122 + 0 + 38 + 497 + 9 = 666.

1220384979 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1220384979 - 2⁸ = 1220384723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220384929) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 345834 + ... + 349344.

It is an arithmetic number, because the mean of its divisors is an integer number (106865486).

Almost surely, 2^1220384979 is an apocalyptic number.

1220384979 is a deficient number, since it is larger than the sum of its proper divisors (703193769).

1220384979 is an frugal number, since it uses more digits than its factorization.

1220384979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039 (or 3525 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1220384979 is about 34934.0089168134. The cubic root of 1220384979 is about 1068.6421121831.

The spelling of 1220384979 in words is "one billion, two hundred twenty million, three hundred eighty-four thousand, nine hundred seventy-nine".