345831 has 8 divisors (see below), whose sum is σ = 488304. Its totient is φ = 216960.

The previous prime is 345823. The next prime is 345853. The reversal of 345831 is 138543.

345831 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 345831 - 2³ = 345823 is a prime.

It is a super-2 number, since 2×345831² = 239198161122, which contains 22 as substring.

345831 is strictly pandigital in base 7.

345831 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345811) 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 7 ways as a sum of consecutive naturals, for example, 3340 + ... + 3441.

It is an arithmetic number, because the mean of its divisors is an integer number (61038).

2³⁴⁵⁸³¹ is an apocalyptic number.

345831 is a deficient number, since it is larger than the sum of its proper divisors (142473).

345831 is a wasteful number, since it uses less digits than its factorization.

345831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6801.

The product of its digits is 1440, while the sum is 24.

The square root of 345831 is about 588.0739749385. The cubic root of 345831 is about 70.1920576075.

It can be divided in two parts, 345 and 831, that added together give a triangular number (1176 = T₄₈).

The spelling of 345831 in words is "three hundred forty-five thousand, eight hundred thirty-one".