247975 has 24 divisors (see below), whose sum is σ = 381920. Its totient is φ = 155520.

The previous prime is 247957. The next prime is 247991. The reversal of 247975 is 579742.

It is not a de Polignac number, because 247975 - 2⁵ = 247943 is a prime.

It is a super-2 number, since 2×247975² = 122983201250, which contains 22 as substring.

247975 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 247975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2221 + ... + 2329.

2²⁴⁷⁹⁷⁵ is an apocalyptic number.

247975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

247975 is a deficient number, since it is larger than the sum of its proper divisors (133945).

247975 is a wasteful number, since it uses less digits than its factorization.

247975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 134 counting only the distinct ones).

The product of its digits is 17640, while the sum is 34.

The square root of 247975 is about 497.9708826829. The cubic root of 247975 is about 62.8255018340.

The spelling of 247975 in words is "two hundred forty-seven thousand, nine hundred seventy-five".