42545540 has 12 divisors (see below), whose sum is σ = 89345676. Its totient is φ = 17018208.

The previous prime is 42545539. The next prime is 42545557. The reversal of 42545540 is 4554524.

It can be written as a sum of positive squares in 2 ways, for example, as 22259524 + 20286016 = 4718^2 + 4504^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063619 + ... + 1063658.

It is an arithmetic number, because the mean of its divisors is an integer number (7445473).

Almost surely, 2^42545540 is an apocalyptic number.

It is an amenable number.

42545540 is an abundant number, since it is smaller than the sum of its proper divisors (46800136).

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

42545540 is a wasteful number, since it uses less digits than its factorization.

42545540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127286 (or 2127284 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 29.

The square root of 42545540 is about 6522.6942286144. The cubic root of 42545540 is about 349.1012040824.

The spelling of 42545540 in words is "forty-two million, five hundred forty-five thousand, five hundred forty".