247643 has 8 divisors (see below), whose sum is σ = 276480. Its totient is φ = 219880.

The previous prime is 247633. The next prime is 247649. The reversal of 247643 is 346742.

It is a happy number.

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 247643 - 2⁶ = 247579 is a prime.

It is a super-2 number, since 2×247643² = 122654110898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247649) 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, 278 + ... + 756.

It is an arithmetic number, because the mean of its divisors is an integer number (34560).

2²⁴⁷⁶⁴³ is an apocalyptic number.

247643 is a deficient number, since it is larger than the sum of its proper divisors (28837).

247643 is a wasteful number, since it uses less digits than its factorization.

247643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537.

The product of its digits is 4032, while the sum is 26.

The square root of 247643 is about 497.6374182073. The cubic root of 247643 is about 62.7974514497.

Subtracting 247643 from its reverse (346742), we obtain a palindrome (99099).

It can be divided in two parts, 24 and 7643, that added together give a palindrome (7667).

The spelling of 247643 in words is "two hundred forty-seven thousand, six hundred forty-three".