247740 has 24 divisors (see below), whose sum is σ = 693840. Its totient is φ = 66048.

The previous prime is 247739. The next prime is 247759. The reversal of 247740 is 47742.

It is a super-2 number, since 2×247740² = 122750215200, which contains 22 as substring.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 247740.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2005 + ... + 2124.

It is an arithmetic number, because the mean of its divisors is an integer number (28910).

2²⁴⁷⁷⁴⁰ is an apocalyptic number.

247740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247740 is an abundant number, since it is smaller than the sum of its proper divisors (446100).

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

247740 is a wasteful number, since it uses less digits than its factorization.

247740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4141 (or 4139 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 24.

The square root of 247740 is about 497.7348691824. The cubic root of 247740 is about 62.8056494843.

The spelling of 247740 in words is "two hundred forty-seven thousand, seven hundred forty", and thus it is an iban number.