247478 has 16 divisors (see below), whose sum is σ = 463104. Its totient is φ = 96360.

The previous prime is 247463. The next prime is 247501. The reversal of 247478 is 874742.

It is a super-2 number, since 2×247478² = 122490720968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 650 + ... + 957.

It is an arithmetic number, because the mean of its divisors is an integer number (28944).

2²⁴⁷⁴⁷⁸ is an apocalyptic number.

247478 is a deficient number, since it is larger than the sum of its proper divisors (215626).

247478 is a wasteful number, since it uses less digits than its factorization.

247478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627.

The product of its digits is 12544, while the sum is 32.

The square root of 247478 is about 497.4716072300. The cubic root of 247478 is about 62.7835014201.

Subtracting 247478 from its reverse (874742), we obtain a square (627264 = 792²).

It can be divided in two parts, 2474 and 78, that added together give a palindrome (2552).

The spelling of 247478 in words is "two hundred forty-seven thousand, four hundred seventy-eight".