257990 has 8 divisors (see below), whose sum is σ = 464400. Its totient is φ = 103192.

The previous prime is 257989. The next prime is 257993. The reversal of 257990 is 99752.

257990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12890 + ... + 12909.

It is an arithmetic number, because the mean of its divisors is an integer number (58050).

2²⁵⁷⁹⁹⁰ is an apocalyptic number.

257990 is a deficient number, since it is larger than the sum of its proper divisors (206410).

257990 is a wasteful number, since it uses less digits than its factorization.

257990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25806.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 257990 is about 507.9271601322. The cubic root of 257990 is about 63.6601451004.

The spelling of 257990 in words is "two hundred fifty-seven thousand, nine hundred ninety".