247904 has 24 divisors (see below), whose sum is σ = 499968. Its totient is φ = 120960.

The previous prime is 247901. The next prime is 247913. The reversal of 247904 is 409742.

It is a super-2 number, since 2×247904² = 122912786432, which contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1889 + ... + 2015.

It is an arithmetic number, because the mean of its divisors is an integer number (20832).

2²⁴⁷⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249984).

247904 is an abundant number, since it is smaller than the sum of its proper divisors (252064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247904 is a wasteful number, since it uses less digits than its factorization.

247904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 247904 is about 497.8995882706. The cubic root of 247904 is about 62.8195052128.

The spelling of 247904 in words is "two hundred forty-seven thousand, nine hundred four".