247389 has 4 divisors (see below), whose sum is σ = 329856. Its totient is φ = 164924.

The previous prime is 247381. The next prime is 247391. The reversal of 247389 is 983742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 247389 - 2³ = 247381 is a prime.

It is a super-2 number, since 2×247389² = 122402634642, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247381) 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 3 ways as a sum of consecutive naturals, for example, 41229 + ... + 41234.

It is an arithmetic number, because the mean of its divisors is an integer number (82464).

2²⁴⁷³⁸⁹ is an apocalyptic number.

It is an amenable number.

247389 is a deficient number, since it is larger than the sum of its proper divisors (82467).

247389 is an equidigital number, since it uses as much as digits as its factorization.

247389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82466.

The product of its digits is 12096, while the sum is 33.

The square root of 247389 is about 497.3821468449. The cubic root of 247389 is about 62.7759742842.

It can be divided in two parts, 247 and 389, that added together give a palindrome (636).

The spelling of 247389 in words is "two hundred forty-seven thousand, three hundred eighty-nine".