247906 has 4 divisors (see below), whose sum is σ = 371862. Its totient is φ = 123952.

The previous prime is 247901. The next prime is 247913. The reversal of 247906 is 609742.

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

It can be written as a sum of positive squares in only one way, i.e., 128881 + 119025 = 359^2 + 345^2 .

It is a super-3 number, since 3×247906³ = 45706963335460248, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61975 + ... + 61978.

2²⁴⁷⁹⁰⁶ is an apocalyptic number.

247906 is a deficient number, since it is larger than the sum of its proper divisors (123956).

247906 is a wasteful number, since it uses less digits than its factorization.

247906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123955.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 247906 is about 497.9015967036. The cubic root of 247906 is about 62.8196741474.

The spelling of 247906 in words is "two hundred forty-seven thousand, nine hundred six".