242740 has 24 divisors (see below), whose sum is σ = 521640. Its totient is φ = 94848.

The previous prime is 242731. The next prime is 242747. The reversal of 242740 is 47242.

242740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 99856 + 142884 = 316^2 + 378^2 .

It is an Ulam number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 946 + ... + 1174.

It is an arithmetic number, because the mean of its divisors is an integer number (21735).

2²⁴²⁷⁴⁰ is an apocalyptic number.

242740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

242740 is an abundant number, since it is smaller than the sum of its proper divisors (278900).

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

242740 is a wasteful number, since it uses less digits than its factorization.

242740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 242740 is about 492.6865129065. The cubic root of 242740 is about 62.3802507082.

Adding to 242740 its reverse (47242), we get a palindrome (289982).

The spelling of 242740 in words is "two hundred forty-two thousand, seven hundred forty", and thus it is an iban number.