247928 has 16 divisors (see below), whose sum is σ = 492480. Its totient is φ = 116608.

The previous prime is 247913. The next prime is 247939. The reversal of 247928 is 829742.

247928 = T₇₂ + T₇₃ + ... + T₁₂₂.

247928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×247928² = 122936586368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247894 and 247903.

It is a congruent number.

It is an unprimeable number.

247928 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776 + ... + 1047.

It is an arithmetic number, because the mean of its divisors is an integer number (30780).

2²⁴⁷⁹²⁸ is an apocalyptic number.

It is an amenable number.

247928 is a deficient number, since it is larger than the sum of its proper divisors (244552).

247928 is a wasteful number, since it uses less digits than its factorization.

247928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846 (or 1842 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 247928 is about 497.9236889324. The cubic root of 247928 is about 62.8215323678.

The spelling of 247928 in words is "two hundred forty-seven thousand, nine hundred twenty-eight".