257923 has 4 divisors (see below), whose sum is σ = 260680. Its totient is φ = 255168.

The previous prime is 257921. The next prime is 257947. The reversal of 257923 is 329752.

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

It is a cyclic number.

It is not a de Polignac number, because 257923 - 2¹ = 257921 is a prime.

It is a Duffinian number.

257923 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 257891 and 257900.

It is not an unprimeable number, because it can be changed into a prime (257921) 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, 1233 + ... + 1426.

It is an arithmetic number, because the mean of its divisors is an integer number (65170).

2²⁵⁷⁹²³ is an apocalyptic number.

257923 is a deficient number, since it is larger than the sum of its proper divisors (2757).

257923 is an equidigital number, since it uses as much as digits as its factorization.

257923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756.

The product of its digits is 3780, while the sum is 28.

The square root of 257923 is about 507.8612015108. The cubic root of 257923 is about 63.6546337770.

The spelling of 257923 in words is "two hundred fifty-seven thousand, nine hundred twenty-three".