7243840 has 28 divisors (see below), whose sum is σ = 17250156. Its totient is φ = 2897408.

The previous prime is 7243837. The next prime is 7243849. The reversal of 7243840 is 483427.

It can be written as a sum of positive squares in 2 ways, for example, as 2262016 + 4981824 = 1504^2 + 2232^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7243799 and 7243808.

It is not an unprimeable number, because it can be changed into a prime (7243849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10999 + ... + 11638.

It is an arithmetic number, because the mean of its divisors is an integer number (616077).

Almost surely, 2^7243840 is an apocalyptic number.

It is an amenable number.

7243840 is an abundant number, since it is smaller than the sum of its proper divisors (10006316).

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

7243840 is a wasteful number, since it uses less digits than its factorization.

7243840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22654 (or 22644 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 7243840 is about 2691.4382772042. The cubic root of 7243840 is about 193.4890013267.

The spelling of 7243840 in words is "seven million, two hundred forty-three thousand, eight hundred forty".