345257 has 4 divisors (see below), whose sum is σ = 376656. Its totient is φ = 313860.

The previous prime is 345229. The next prime is 345259. The reversal of 345257 is 752543.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 345257 - 2⁶ = 345193 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 345257.

It is not an unprimeable number, because it can be changed into a prime (345259) 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, 15683 + ... + 15704.

It is an arithmetic number, because the mean of its divisors is an integer number (94164).

2³⁴⁵²⁵⁷ is an apocalyptic number.

It is an amenable number.

345257 is a deficient number, since it is larger than the sum of its proper divisors (31399).

345257 is a wasteful number, since it uses less digits than its factorization.

345257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31398.

The product of its digits is 4200, while the sum is 26.

The square root of 345257 is about 587.5857384246. The cubic root of 345257 is about 70.1532018730.

The spelling of 345257 in words is "three hundred forty-five thousand, two hundred fifty-seven".