1220305406 has 16 divisors (see below), whose sum is σ = 1844591616. Its totient is φ = 605454456.

The previous prime is 1220305397. The next prime is 1220305417. The reversal of 1220305406 is 6045030221.

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 7 ways as a sum of consecutive naturals, for example, 213275 + ... + 218921.

It is an arithmetic number, because the mean of its divisors is an integer number (115286976).

Almost surely, 2^1220305406 is an apocalyptic number.

1220305406 is a deficient number, since it is larger than the sum of its proper divisors (624286210).

1220305406 is a wasteful number, since it uses less digits than its factorization.

1220305406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6463.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1220305406 is about 34932.8699937466. The cubic root of 1220305406 is about 1068.6188853849.

Adding to 1220305406 its reverse (6045030221), we get a palindrome (7265335627).

The spelling of 1220305406 in words is "one billion, two hundred twenty million, three hundred five thousand, four hundred six".