42240531 has 8 divisors (see below), whose sum is σ = 56401920. Its totient is φ = 28119752.

The previous prime is 42240511. The next prime is 42240533. The reversal of 42240531 is 13504224.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42240531 - 2⁶ = 42240467 is a prime.

It is a super-2 number, since 2×42240531² = 3568524918323922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42240498 and 42240507.

It is not an unprimeable number, because it can be changed into a prime (42240533) 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, 7635 + ... + 11948.

It is an arithmetic number, because the mean of its divisors is an integer number (7050240).

Almost surely, 2^42240531 is an apocalyptic number.

42240531 is a deficient number, since it is larger than the sum of its proper divisors (14161389).

42240531 is a wasteful number, since it uses less digits than its factorization.

42240531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20305.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 42240531 is about 6499.2715745690. The cubic root of 42240531 is about 348.2649669837.

Adding to 42240531 its reverse (13504224), we get a palindrome (55744755).

The spelling of 42240531 in words is "forty-two million, two hundred forty thousand, five hundred thirty-one".