42643240 has 32 divisors (see below), whose sum is σ = 98543880. Its totient is φ = 16595712.

The previous prime is 42643213. The next prime is 42643247. The reversal of 42643240 is 4234624.

It can be written as a sum of positive squares in 4 ways, for example, as 35450116 + 7193124 = 5954^2 + 2682^2 .

It is not an unprimeable number, because it can be changed into a prime (42643247) 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, 12927 + ... + 15886.

Almost surely, 2^42643240 is an apocalyptic number.

42643240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42643240 is an abundant number, since it is smaller than the sum of its proper divisors (55900640).

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

42643240 is a wasteful number, since it uses less digits than its factorization.

42643240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28861 (or 28857 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 42643240 is about 6530.1791705894. The cubic root of 42643240 is about 349.3682208163.

Adding to 42643240 its reverse (4234624), we get a palindrome (46877864).

The spelling of 42643240 in words is "forty-two million, six hundred forty-three thousand, two hundred forty".