345998 has 4 divisors (see below), whose sum is σ = 519000. Its totient is φ = 172998.

The previous prime is 345997. The next prime is 346013. The reversal of 345998 is 899543.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899543 = 577 ⋅1559.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86498 + ... + 86501.

It is an arithmetic number, because the mean of its divisors is an integer number (129750).

2³⁴⁵⁹⁹⁸ is an apocalyptic number.

345998 is a deficient number, since it is larger than the sum of its proper divisors (173002).

345998 is a wasteful number, since it uses less digits than its factorization.

345998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173001.

The product of its digits is 38880, while the sum is 38.

The square root of 345998 is about 588.2159467407. The cubic root of 345998 is about 70.2033542497.

The spelling of 345998 in words is "three hundred forty-five thousand, nine hundred ninety-eight".