42661540 has 24 divisors (see below), whose sum is σ = 89712000. Its totient is φ = 17041248.

The previous prime is 42661537. The next prime is 42661589. The reversal of 42661540 is 4516624.

42661540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 42661499 and 42661508.

It is an unprimeable number.

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, 27711 + ... + 29209.

It is an arithmetic number, because the mean of its divisors is an integer number (3738000).

Almost surely, 2^42661540 is an apocalyptic number.

It is an amenable number.

42661540 is an abundant number, since it is smaller than the sum of its proper divisors (47050460).

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

42661540 is a wasteful number, since it uses less digits than its factorization.

42661540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2931 (or 2929 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 42661540 is about 6531.5802069637. The cubic root of 42661540 is about 349.4181898469.

The spelling of 42661540 in words is "forty-two million, six hundred sixty-one thousand, five hundred forty".