247509 has 16 divisors (see below), whose sum is σ = 374400. Its totient is φ = 161568.

The previous prime is 247501. The next prime is 247519. The reversal of 247509 is 905742.

It is not a de Polignac number, because 247509 - 2³ = 247501 is a prime.

It is a super-2 number, since 2×247509² = 122521410162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 247509.

It is not an unprimeable number, because it can be changed into a prime (247501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2352 + ... + 2454.

It is an arithmetic number, because the mean of its divisors is an integer number (23400).

2²⁴⁷⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

247509 is a deficient number, since it is larger than the sum of its proper divisors (126891).

247509 is a wasteful number, since it uses less digits than its factorization.

247509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 247509 is about 497.5027638114. The cubic root of 247509 is about 62.7861228077.

The spelling of 247509 in words is "two hundred forty-seven thousand, five hundred nine".