42531540 has 24 divisors (see below), whose sum is σ = 119088480. Its totient is φ = 11341728.

The previous prime is 42531539. The next prime is 42531547. The reversal of 42531540 is 4513524.

42531540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 42531540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42531547) 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 7 ways as a sum of consecutive naturals, for example, 354370 + ... + 354489.

It is an arithmetic number, because the mean of its divisors is an integer number (4962020).

Almost surely, 2^42531540 is an apocalyptic number.

It is an amenable number.

42531540 is an abundant number, since it is smaller than the sum of its proper divisors (76556940).

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

42531540 is a wasteful number, since it uses less digits than its factorization.

42531540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708871 (or 708869 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 42531540 is about 6521.6209641469. The cubic root of 42531540 is about 349.0629082309.

It can be divided in two parts, 42531 and 540, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 42531540 in words is "forty-two million, five hundred thirty-one thousand, five hundred forty".