1345442220 has 72 divisors (see below), whose sum is σ = 4321253664. Its totient is φ = 337678848.

The previous prime is 1345442207. The next prime is 1345442221. The reversal of 1345442220 is 222445431.

It is not an unprimeable number, because it can be changed into a prime (1345442221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216784 + ... + 222903.

It is an arithmetic number, because the mean of its divisors is an integer number (60017412).

Almost surely, 2^1345442220 is an apocalyptic number.

1345442220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1345442220 is an abundant number, since it is smaller than the sum of its proper divisors (2975811444).

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

1345442220 is a wasteful number, since it uses less digits than its factorization.

1345442220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439719 (or 439714 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 1345442220 is about 36680.2701734870. The cubic root of 1345442220 is about 1103.9642690862.

Adding to 1345442220 its reverse (222445431), we get a palindrome (1567887651).

The spelling of 1345442220 in words is "one billion, three hundred forty-five million, four hundred forty-two thousand, two hundred twenty".