257693869 has 8 divisors (see below), whose sum is σ = 261817920. Its totient is φ = 253586016.

The previous prime is 257693833. The next prime is 257693879. The reversal of 257693869 is 968396752.

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 257693869 - 2⁷ = 257693741 is a prime.

It is a super-2 number, since 2×257693869² = 132812260240378322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257693879) 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, 30312 + ... + 37870.

It is an arithmetic number, because the mean of its divisors is an integer number (32727240).

Almost surely, 2^257693869 is an apocalyptic number.

It is an amenable number.

257693869 is a deficient number, since it is larger than the sum of its proper divisors (4124051).

257693869 is an equidigital number, since it uses as much as digits as its factorization.

257693869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8099.

The product of its digits is 4898880, while the sum is 55.

The square root of 257693869 is about 16052.8461339415. The cubic root of 257693869 is about 636.3577857465.

The spelling of 257693869 in words is "two hundred fifty-seven million, six hundred ninety-three thousand, eight hundred sixty-nine".