247749 has 8 divisors (see below), whose sum is σ = 332640. Its totient is φ = 164016.

The previous prime is 247739. The next prime is 247759. The reversal of 247749 is 947742.

It is an interprime number because it is at equal distance from previous prime (247739) and next prime (247759).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 247749 - 2⁵ = 247717 is a prime.

It is a super-2 number, since 2×247749² = 122759134002, which contains 22 as substring.

247749 is a lucky number.

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 247749.

It is not an unprimeable number, because it can be changed into a prime (247729) 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 7 ways as a sum of consecutive naturals, for example, 654 + ... + 960.

It is an arithmetic number, because the mean of its divisors is an integer number (41580).

2²⁴⁷⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

247749 is a deficient number, since it is larger than the sum of its proper divisors (84891).

247749 is a wasteful number, since it uses less digits than its factorization.

247749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579.

The product of its digits is 14112, while the sum is 33.

The square root of 247749 is about 497.7439100582. The cubic root of 247749 is about 62.8064100182.

The spelling of 247749 in words is "two hundred forty-seven thousand, seven hundred forty-nine".