247573 has 4 divisors (see below), whose sum is σ = 256140. Its totient is φ = 239008.

The previous prime is 247553. The next prime is 247579. The reversal of 247573 is 375742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 375742 = 2 ⋅187871.

It can be written as a sum of positive squares in 2 ways, for example, as 178929 + 68644 = 423^2 + 262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247573 is a prime.

It is a super-2 number, since 2×247573² = 122584780658, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247579) 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, 4240 + ... + 4297.

It is an arithmetic number, because the mean of its divisors is an integer number (64035).

2²⁴⁷⁵⁷³ is an apocalyptic number.

It is an amenable number.

247573 is a deficient number, since it is larger than the sum of its proper divisors (8567).

247573 is an equidigital number, since it uses as much as digits as its factorization.

247573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8566.

The product of its digits is 5880, while the sum is 28.

The square root of 247573 is about 497.5670809047. The cubic root of 247573 is about 62.7915340123.

It can be divided in two parts, 247 and 573, that added together give a triangular number (820 = T₄₀).

The spelling of 247573 in words is "two hundred forty-seven thousand, five hundred seventy-three".