42406540 has 24 divisors (see below), whose sum is σ = 97150032. Its totient is φ = 15420480.

The previous prime is 42406531. The next prime is 42406541. The reversal of 42406540 is 4560424.

It is not an unprimeable number, because it can be changed into a prime (42406541) 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, 96159 + ... + 96598.

It is an arithmetic number, because the mean of its divisors is an integer number (4047918).

Almost surely, 2^42406540 is an apocalyptic number.

It is an amenable number.

42406540 is an abundant number, since it is smaller than the sum of its proper divisors (54743492).

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

42406540 is a wasteful number, since it uses less digits than its factorization.

42406540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192777 (or 192775 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 42406540 is about 6512.0304053344. The cubic root of 42406540 is about 348.7206079125.

Adding to 42406540 its reverse (4560424), we get a palindrome (46966964).

The spelling of 42406540 in words is "forty-two million, four hundred six thousand, five hundred forty".