42540723 has 6 divisors (see below), whose sum is σ = 61447724. Its totient is φ = 28360476.

The previous prime is 42540721. The next prime is 42540733. The reversal of 42540723 is 32704524.

42540723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42540723 - 2¹ = 42540721 is a prime.

It is a super-2 number, since 2×42540723² = 3619426226725458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42540721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2363365 + ... + 2363382.

Almost surely, 2^42540723 is an apocalyptic number.

42540723 is a deficient number, since it is larger than the sum of its proper divisors (18907001).

42540723 is a wasteful number, since it uses less digits than its factorization.

42540723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4726753 (or 4726750 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 42540723 is about 6522.3249689049. The cubic root of 42540723 is about 349.0880285222.

The spelling of 42540723 in words is "forty-two million, five hundred forty thousand, seven hundred twenty-three".