247669 has 4 divisors (see below), whose sum is σ = 252396. Its totient is φ = 242944.

The previous prime is 247651. The next prime is 247691. The reversal of 247669 is 966742.

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

It can be written as a sum of positive squares in 2 ways, for example, as 213444 + 34225 = 462^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 247669 - 2¹¹ = 245621 is a prime.

It is a super-2 number, since 2×247669² = 122679867122, 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 (247609) 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, 2284 + ... + 2389.

It is an arithmetic number, because the mean of its divisors is an integer number (63099).

2²⁴⁷⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

247669 is a deficient number, since it is larger than the sum of its proper divisors (4727).

247669 is an equidigital number, since it uses as much as digits as its factorization.

247669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726.

The product of its digits is 18144, while the sum is 34.

The square root of 247669 is about 497.6635409592. The cubic root of 247669 is about 62.7996490710.

The spelling of 247669 in words is "two hundred forty-seven thousand, six hundred sixty-nine".