247385 has 4 divisors (see below), whose sum is σ = 296868. Its totient is φ = 197904.

The previous prime is 247381. The next prime is 247391. The reversal of 247385 is 583742.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71824 + 175561 = 268^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 247385 - 2² = 247381 is a prime.

It is a super-2 number, since 2×247385² = 122398676450, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24734 + ... + 24743.

It is an arithmetic number, because the mean of its divisors is an integer number (74217).

2²⁴⁷³⁸⁵ is an apocalyptic number.

It is an amenable number.

247385 is a deficient number, since it is larger than the sum of its proper divisors (49483).

247385 is an equidigital number, since it uses as much as digits as its factorization.

247385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49482.

The product of its digits is 6720, while the sum is 29.

The square root of 247385 is about 497.3781257756. The cubic root of 247385 is about 62.7756359436.

The spelling of 247385 in words is "two hundred forty-seven thousand, three hundred eighty-five".