247408 has 30 divisors (see below), whose sum is σ = 559736. Its totient is φ = 103776.

The previous prime is 247393. The next prime is 247409. The reversal of 247408 is 804742.

247408 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 2×247408² = 122421436928, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247409) by changing a digit.

247408 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 5 ways as a sum of consecutive naturals, for example, 5241 + ... + 5287.

2²⁴⁷⁴⁰⁸ is an apocalyptic number.

247408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279868).

247408 is an abundant number, since it is smaller than the sum of its proper divisors (312328).

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

247408 is an equidigital number, since it uses as much as digits as its factorization.

247408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 247408 is about 497.4012464801. The cubic root of 247408 is about 62.7775813524. Note that the first 3 decimals are identical.

Multiplying 247408 by its product of nonzero digits (1792), we get a square (443355136 = 21056²).

The spelling of 247408 in words is "two hundred forty-seven thousand, four hundred eight".