345880 has 16 divisors (see below), whose sum is σ = 778320. Its totient is φ = 138336.

The previous prime is 345869. The next prime is 345881. The reversal of 345880 is 88543.

345880 = T₁₁₁ + T₁₁₂ + ... + T₁₅₀.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4284 + ... + 4363.

It is an arithmetic number, because the mean of its divisors is an integer number (48645).

2³⁴⁵⁸⁸⁰ is an apocalyptic number.

It is an amenable number.

345880 is an abundant number, since it is smaller than the sum of its proper divisors (432440).

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

345880 is a wasteful number, since it uses less digits than its factorization.

345880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8658 (or 8654 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 345880 is about 588.1156348882. The cubic root of 345880 is about 70.1953725680.

It can be divided in two parts, 345 and 880, that added together give a triangular number (1225 = T₄₉).

The spelling of 345880 in words is "three hundred forty-five thousand, eight hundred eighty".