345440420 has 24 divisors (see below), whose sum is σ = 781227384. Its totient is φ = 127547136.

The previous prime is 345440411. The next prime is 345440423. The reversal of 345440420 is 24044543.

It can be written as a sum of positive squares in 4 ways, for example, as 51523684 + 293916736 = 7178^2 + 17144^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 345440420.

It is not an unprimeable number, because it can be changed into a prime (345440423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664049 + ... + 664568.

It is an arithmetic number, because the mean of its divisors is an integer number (32551141).

Almost surely, 2^345440420 is an apocalyptic number.

It is an amenable number.

345440420 is an abundant number, since it is smaller than the sum of its proper divisors (435786964).

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

345440420 is a wasteful number, since it uses less digits than its factorization.

345440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328639 (or 1328637 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 345440420 is about 18586.0275475961. The cubic root of 345440420 is about 701.6562278682.

Adding to 345440420 its reverse (24044543), we get a palindrome (369484963).

The spelling of 345440420 in words is "three hundred forty-five million, four hundred forty thousand, four hundred twenty".