1220361306 has 16 divisors (see below), whose sum is σ = 2506688544. Its totient is φ = 395792784.

The previous prime is 1220361299. The next prime is 1220361323. The reversal of 1220361306 is 6031630221.

It is a happy number.

1220361306 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2748340 + ... + 2748783.

It is an arithmetic number, because the mean of its divisors is an integer number (156668034).

Almost surely, 2^1220361306 is an apocalyptic number.

1220361306 is an abundant number, since it is smaller than the sum of its proper divisors (1286327238).

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

1220361306 is a wasteful number, since it uses less digits than its factorization.

1220361306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5497165.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 1220361306 is about 34933.6700906160. The cubic root of 1220361306 is about 1068.6352023067.

Adding to 1220361306 its reverse (6031630221), we get a palindrome (7251991527).

It can be divided in two parts, 1220 and 361306, that added together give a triangular number (362526 = T₈₅₁).

The spelling of 1220361306 in words is "one billion, two hundred twenty million, three hundred sixty-one thousand, three hundred six".