257820983 has 8 divisors (see below), whose sum is σ = 297570720. Its totient is φ = 218800800.

The previous prime is 257820977. The next prime is 257821001. The reversal of 257820983 is 389028752.

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

It is a cyclic number.

It is not a de Polignac number, because 257820983 - 2⁶ = 257820919 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 (257820923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181628 + ... + 183041.

It is an arithmetic number, because the mean of its divisors is an integer number (37196340).

Almost surely, 2^257820983 is an apocalyptic number.

257820983 is a deficient number, since it is larger than the sum of its proper divisors (39749737).

257820983 is a wasteful number, since it uses less digits than its factorization.

257820983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364777.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 257820983 is about 16056.8048814202. The cubic root of 257820983 is about 636.4624017225.

The spelling of 257820983 in words is "two hundred fifty-seven million, eight hundred twenty thousand, nine hundred eighty-three".