345421 has 4 divisors (see below), whose sum is σ = 348700. Its totient is φ = 342144.

The previous prime is 345413. The next prime is 345431. The reversal of 345421 is 124543.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 264196 + 81225 = 514^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 345421 - 2³ = 345413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345431) 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, 1476 + ... + 1693.

It is an arithmetic number, because the mean of its divisors is an integer number (87175).

2³⁴⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

345421 is a deficient number, since it is larger than the sum of its proper divisors (3279).

345421 is a wasteful number, since it uses less digits than its factorization.

345421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278.

The product of its digits is 480, while the sum is 19.

The square root of 345421 is about 587.7252759581. The cubic root of 345421 is about 70.1643079031.

Adding to 345421 its reverse (124543), we get a palindrome (469964).

It can be divided in two parts, 34542 and 1, that added together give a palindrome (34543).

The spelling of 345421 in words is "three hundred forty-five thousand, four hundred twenty-one".