345890 has 8 divisors (see below), whose sum is σ = 622620. Its totient is φ = 138352.

The previous prime is 345889. The next prime is 345907. The reversal of 345890 is 98543.

It can be written as a sum of positive squares in 2 ways, for example, as 279841 + 66049 = 529^2 + 257^2 .

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

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17285 + ... + 17304.

2³⁴⁵⁸⁹⁰ is an apocalyptic number.

345890 is a deficient number, since it is larger than the sum of its proper divisors (276730).

345890 is a wasteful number, since it uses less digits than its factorization.

345890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34596.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 345890 is about 588.1241365562. The cubic root of 345890 is about 70.1960490521.

The spelling of 345890 in words is "three hundred forty-five thousand, eight hundred ninety".