247940 has 72 divisors (see below), whose sum is σ = 689472. Its totient is φ = 73920.

The previous prime is 247939. The next prime is 247943. The reversal of 247940 is 49742.

247940 = T₁₃₉ + T₁₄₀ + ... + T₁₆₀.

It is a super-2 number, since 2×247940² = 122948487200, which contains 22 as substring.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (247943) 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 23 ways as a sum of consecutive naturals, for example, 10769 + ... + 10791.

It is an arithmetic number, because the mean of its divisors is an integer number (9576).

2²⁴⁷⁹⁴⁰ is an apocalyptic number.

247940 is a gapful number since it is divisible by the number (20) 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 247940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344736).

247940 is an abundant number, since it is smaller than the sum of its proper divisors (441532).

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

247940 is a wasteful number, since it uses less digits than its factorization.

247940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57 (or 48 counting only the distinct ones).

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

The square root of 247940 is about 497.9357388258. The cubic root of 247940 is about 62.8225458962.

The spelling of 247940 in words is "two hundred forty-seven thousand, nine hundred forty".