247139 has 4 divisors (see below), whose sum is σ = 251856. Its totient is φ = 242424.

The previous prime is 247099. The next prime is 247141. The reversal of 247139 is 931742.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 247139 - 2¹⁶ = 181603 is a prime.

It is a super-2 number, since 2×247139² = 122155370642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2279 + ... + 2384.

It is an arithmetic number, because the mean of its divisors is an integer number (62964).

2²⁴⁷¹³⁹ is an apocalyptic number.

247139 is a deficient number, since it is larger than the sum of its proper divisors (4717).

247139 is an equidigital number, since it uses as much as digits as its factorization.

247139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4716.

The product of its digits is 1512, while the sum is 26.

The square root of 247139 is about 497.1307675049. The cubic root of 247139 is about 62.7548209816.

It can be divided in two parts, 2471 and 39, that multiplied together give a palindrome (96369).

The spelling of 247139 in words is "two hundred forty-seven thousand, one hundred thirty-nine".