42115540 has 24 divisors (see below), whose sum is σ = 91493640. Its totient is φ = 16265088.

The previous prime is 42115523. The next prime is 42115543. The reversal of 42115540 is 4551124.

It can be written as a sum of positive squares in 4 ways, for example, as 9351364 + 32764176 = 3058^2 + 5724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42115543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35727 + ... + 36886.

It is an arithmetic number, because the mean of its divisors is an integer number (3812235).

Almost surely, 2^42115540 is an apocalyptic number.

It is an amenable number.

42115540 is an abundant number, since it is smaller than the sum of its proper divisors (49378100).

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

42115540 is a wasteful number, since it uses less digits than its factorization.

42115540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72651 (or 72649 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 42115540 is about 6489.6486807839. The cubic root of 42115540 is about 347.9211187752.

Adding to 42115540 its reverse (4551124), we get a palindrome (46666664).

The spelling of 42115540 in words is "forty-two million, one hundred fifteen thousand, five hundred forty".