247989 has 16 divisors (see below), whose sum is σ = 387200. Its totient is φ = 141120.

The previous prime is 247957. The next prime is 247991. The reversal of 247989 is 989742.

It is not a de Polignac number, because 247989 - 2⁵ = 247957 is a prime.

It is a super-2 number, since 2×247989² = 122997088242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247939) 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, 909 + ... + 1149.

It is an arithmetic number, because the mean of its divisors is an integer number (24200).

2²⁴⁷⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

247989 is a deficient number, since it is larger than the sum of its proper divisors (139211).

247989 is an equidigital number, since it uses as much as digits as its factorization.

247989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 251 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 247989 is about 497.9849395313. The cubic root of 247989 is about 62.8266841312.

The spelling of 247989 in words is "two hundred forty-seven thousand, nine hundred eighty-nine".