42540724 has 12 divisors (see below), whose sum is σ = 74558848. Its totient is φ = 21238200.

The previous prime is 42540721. The next prime is 42540733. The reversal of 42540724 is 42704524.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 42540692 and 42540701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540721) 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, 4932 + ... + 10459.

Almost surely, 2^42540724 is an apocalyptic number.

It is an amenable number.

42540724 is a deficient number, since it is larger than the sum of its proper divisors (32018124).

42540724 is a wasteful number, since it uses less digits than its factorization.

42540724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16086 (or 16084 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 28.

The square root of 42540724 is about 6522.3250455647. The cubic root of 42540724 is about 349.0880312575.

It can be divided in two parts, 42540 and 724, that added together give a square (43264 = 208²).

The spelling of 42540724 in words is "forty-two million, five hundred forty thousand, seven hundred twenty-four".