42540861 has 16 divisors (see below), whose sum is σ = 63551808. Its totient is φ = 25084800.

The previous prime is 42540859. The next prime is 42540899. The reversal of 42540861 is 16804524.

It is not a de Polignac number, because 42540861 - 2¹ = 42540859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42540461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16200 + ... + 18641.

It is an arithmetic number, because the mean of its divisors is an integer number (3971988).

Almost surely, 2^42540861 is an apocalyptic number.

It is an amenable number.

42540861 is a deficient number, since it is larger than the sum of its proper divisors (21010947).

42540861 is a wasteful number, since it uses less digits than its factorization.

42540861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34892.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 42540861 is about 6522.3355479460. The cubic root of 42540861 is about 349.0884059965.

The spelling of 42540861 in words is "forty-two million, five hundred forty thousand, eight hundred sixty-one".