345872 has 10 divisors (see below), whose sum is σ = 670158. Its totient is φ = 172928.

The previous prime is 345869. The next prime is 345881. The reversal of 345872 is 278543.

It is a happy number.

345872 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 246016 + 99856 = 496^2 + 316^2 .

It is an alternating number because its digits alternate between odd and even.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 345872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10793 + ... + 10824.

2³⁴⁵⁸⁷² is an apocalyptic number.

It is an amenable number.

345872 is a deficient number, since it is larger than the sum of its proper divisors (324286).

345872 is a wasteful number, since it uses less digits than its factorization.

345872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21625 (or 21619 counting only the distinct ones).

The product of its digits is 6720, while the sum is 29.

The square root of 345872 is about 588.1088334654. The cubic root of 345872 is about 70.1948313714.

The spelling of 345872 in words is "three hundred forty-five thousand, eight hundred seventy-two".