1345023220 has 12 divisors (see below), whose sum is σ = 2824548804. Its totient is φ = 538009280.

The previous prime is 1345023193. The next prime is 1345023247. The reversal of 1345023220 is 223205431.

It is an interprime number because it is at equal distance from previous prime (1345023193) and next prime (1345023247).

It can be written as a sum of positive squares in 2 ways, for example, as 413796964 + 931226256 = 20342^2 + 30516^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1345023191 and 1345023200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33625561 + ... + 33625600.

It is an arithmetic number, because the mean of its divisors is an integer number (235379067).

Almost surely, 2^1345023220 is an apocalyptic number.

1345023220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1345023220 is an abundant number, since it is smaller than the sum of its proper divisors (1479525584).

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

1345023220 is a wasteful number, since it uses less digits than its factorization.

1345023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67251170 (or 67251168 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 1345023220 is about 36674.5582113814. The cubic root of 1345023220 is about 1103.8496576850.

Adding to 1345023220 its reverse (223205431), we get a palindrome (1568228651).

The spelling of 1345023220 in words is "one billion, three hundred forty-five million, twenty-three thousand, two hundred twenty".