42542040 has 64 divisors (see below), whose sum is σ = 130053600. Its totient is φ = 11128832.

The previous prime is 42542011. The next prime is 42542047. The reversal of 42542040 is 4024524.

It is a junction number, because it is equal to n+sod(n) for n = 42541998 and 42542016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42542047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3016 + ... + 9704.

Almost surely, 2^42542040 is an apocalyptic number.

42542040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42542040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65026800).

42542040 is an abundant number, since it is smaller than the sum of its proper divisors (87511560).

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

42542040 is a wasteful number, since it uses less digits than its factorization.

42542040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6756 (or 6752 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 42542040 is about 6522.4259290543. The cubic root of 42542040 is about 349.0916309072.

Adding to 42542040 its reverse (4024524), we get a palindrome (46566564).

The spelling of 42542040 in words is "forty-two million, five hundred forty-two thousand, forty".