257378 has 8 divisors (see below), whose sum is σ = 421200. Its totient is φ = 116980.

The previous prime is 257371. The next prime is 257381. The reversal of 257378 is 873752.

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

It is a Curzon number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (257371) by changing a digit.

257378 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5828 + ... + 5871.

It is an arithmetic number, because the mean of its divisors is an integer number (52650).

2²⁵⁷³⁷⁸ is an apocalyptic number.

257378 is a deficient number, since it is larger than the sum of its proper divisors (163822).

257378 is a wasteful number, since it uses less digits than its factorization.

257378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11712.

The product of its digits is 11760, while the sum is 32.

The square root of 257378 is about 507.3243538408. The cubic root of 257378 is about 63.6097673645.

The spelling of 257378 in words is "two hundred fifty-seven thousand, three hundred seventy-eight".