247605 has 16 divisors (see below), whose sum is σ = 419904. Its totient is φ = 124160.

The previous prime is 247603. The next prime is 247607. The reversal of 247605 is 506742.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (247603) and next prime (247607).

It is not a de Polignac number, because 247605 - 2¹ = 247603 is a prime.

It is a super-2 number, since 2×247605² = 122616472050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247601) 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, 231 + ... + 740.

It is an arithmetic number, because the mean of its divisors is an integer number (26244).

2²⁴⁷⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

247605 is a deficient number, since it is larger than the sum of its proper divisors (172299).

247605 is a wasteful number, since it uses less digits than its factorization.

247605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 247605 is about 497.5992363338. The cubic root of 247605 is about 62.7942392649.

The spelling of 247605 in words is "two hundred forty-seven thousand, six hundred five".