42542145 has 16 divisors (see below), whose sum is σ = 75630720. Its totient is φ = 22689072.

The previous prime is 42542141. The next prime is 42542147. The reversal of 42542145 is 54124524.

It is not a de Polignac number, because 42542145 - 2² = 42542141 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (42542141) 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, 157429 + ... + 157698.

It is an arithmetic number, because the mean of its divisors is an integer number (4726920).

Almost surely, 2^42542145 is an apocalyptic number.

42542145 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42542145 is a deficient number, since it is larger than the sum of its proper divisors (33088575).

42542145 is a wasteful number, since it uses less digits than its factorization.

42542145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315141 (or 315135 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 42542145 is about 6522.4339782017. The cubic root of 42542145 is about 349.0919181101.

Adding to 42542145 its reverse (54124524), we get a palindrome (96666669).

The spelling of 42542145 in words is "forty-two million, five hundred forty-two thousand, one hundred forty-five".