345921 has 8 divisors (see below), whose sum is σ = 468384. Its totient is φ = 227040.

The previous prime is 345907. The next prime is 345923. The reversal of 345921 is 129543.

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

It is not a de Polignac number, because 345921 - 2⁵ = 345889 is a prime.

It is a super-2 number, since 2×345921² = 239322676482, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 345891 and 345900.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 345921.

It is not an unprimeable number, because it can be changed into a prime (345923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (58548).

2³⁴⁵⁹²¹ is an apocalyptic number.

It is an amenable number.

345921 is a deficient number, since it is larger than the sum of its proper divisors (122463).

345921 is a wasteful number, since it uses less digits than its factorization.

345921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791.

The product of its digits is 1080, while the sum is 24.

The square root of 345921 is about 588.1504909460. The cubic root of 345921 is about 70.1981460700.

The spelling of 345921 in words is "three hundred forty-five thousand, nine hundred twenty-one".