247923 has 18 divisors (see below), whose sum is σ = 390156. Its totient is φ = 151632.

The previous prime is 247913. The next prime is 247939. The reversal of 247923 is 329742.

It is not a de Polignac number, because 247923 - 2¹⁰ = 246899 is a prime.

It is a super-2 number, since 2×247923² = 122931627858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247913) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1440 + ... + 1602.

2²⁴⁷⁹²³ is an apocalyptic number.

247923 is a deficient number, since it is larger than the sum of its proper divisors (142233).

247923 is a wasteful number, since it uses less digits than its factorization.

247923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 179 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 247923 is about 497.9186680573. The cubic root of 247923 is about 62.8211100546.

The spelling of 247923 in words is "two hundred forty-seven thousand, nine hundred twenty-three".