42506740 has 24 divisors (see below), whose sum is σ = 90397440. Its totient is φ = 16786848.

The previous prime is 42506731. The next prime is 42506741. The reversal of 42506740 is 4760524.

It is a junction number, because it is equal to n+sod(n) for n = 42506699 and 42506708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42506741) 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, 11872 + ... + 15031.

It is an arithmetic number, because the mean of its divisors is an integer number (3766560).

Almost surely, 2^42506740 is an apocalyptic number.

It is an amenable number.

42506740 is an abundant number, since it is smaller than the sum of its proper divisors (47890700).

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

42506740 is a wasteful number, since it uses less digits than its factorization.

42506740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26991 (or 26989 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 42506740 is about 6519.7193191118. The cubic root of 42506740 is about 348.9950492315.

The spelling of 42506740 in words is "forty-two million, five hundred six thousand, seven hundred forty".