247345 has 16 divisors (see below), whose sum is σ = 350208. Its totient is φ = 164160.

The previous prime is 247343. The next prime is 247363. The reversal of 247345 is 543742.

247345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 247345 - 2¹ = 247343 is a prime.

It is a super-2 number, since 2×247345² = 122359098050, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁹ + 4⁶ + 3¹¹ + 7² + 4⁸ + 5 .

It is a Duffinian number.

Its product of digits (3360) is a multiple of the sum of its prime divisors (240).

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (247343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1200 + ... + 1390.

It is an arithmetic number, because the mean of its divisors is an integer number (21888).

2²⁴⁷³⁴⁵ is an apocalyptic number.

It is an amenable number.

247345 is a deficient number, since it is larger than the sum of its proper divisors (102863).

247345 is a wasteful number, since it uses less digits than its factorization.

247345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240.

The product of its digits is 3360, while the sum is 25.

The square root of 247345 is about 497.3379132944. The cubic root of 247345 is about 62.7722523366.

The spelling of 247345 in words is "two hundred forty-seven thousand, three hundred forty-five".