345640321 has 12 divisors (see below), whose sum is σ = 382985328. Its totient is φ = 311626224.

The previous prime is 345640289. The next prime is 345640331. The reversal of 345640321 is 123046543.

It is not a de Polignac number, because 345640321 - 2⁵ = 345640289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 345640321.

It is not an unprimeable number, because it can be changed into a prime (345640331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16515 + ... + 31048.

It is an arithmetic number, because the mean of its divisors is an integer number (31915444).

Almost surely, 2^345640321 is an apocalyptic number.

It is an amenable number.

345640321 is a deficient number, since it is larger than the sum of its proper divisors (37345007).

345640321 is a wasteful number, since it uses less digits than its factorization.

345640321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47632 (or 47619 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 345640321 is about 18591.4044923992. The cubic root of 345640321 is about 701.7915476189.

Adding to 345640321 its reverse (123046543), we get a palindrome (468686864).

The spelling of 345640321 in words is "three hundred forty-five million, six hundred forty thousand, three hundred twenty-one".