257238447 has 4 divisors (see below), whose sum is σ = 342984600. Its totient is φ = 171492296.

The previous prime is 257238437. The next prime is 257238451. The reversal of 257238447 is 744832752.

It is a happy number.

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 257238447 - 2⁶ = 257238383 is a prime.

It is a super-2 number, since 2×257238447² = 132343237229943618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257238399 and 257238408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257238437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42873072 + ... + 42873077.

It is an arithmetic number, because the mean of its divisors is an integer number (85746150).

Almost surely, 2^257238447 is an apocalyptic number.

257238447 is a deficient number, since it is larger than the sum of its proper divisors (85746153).

257238447 is an equidigital number, since it uses as much as digits as its factorization.

257238447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85746152.

The product of its digits is 376320, while the sum is 42.

The square root of 257238447 is about 16038.6547752609. The cubic root of 257238447 is about 635.9826866257.

The spelling of 257238447 in words is "two hundred fifty-seven million, two hundred thirty-eight thousand, four hundred forty-seven".