42542865 has 12 divisors (see below), whose sum is σ = 73741044. Its totient is φ = 22689504.

The previous prime is 42542861. The next prime is 42542887. The reversal of 42542865 is 56824524.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4498641 + 38044224 = 2121^2 + 6168^2 .

It is not a de Polignac number, because 42542865 - 2² = 42542861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42542861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472654 + ... + 472743.

It is an arithmetic number, because the mean of its divisors is an integer number (6145087).

Almost surely, 2^42542865 is an apocalyptic number.

42542865 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42542865 is a deficient number, since it is larger than the sum of its proper divisors (31198179).

42542865 is a wasteful number, since it uses less digits than its factorization.

42542865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945408 (or 945405 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The square root of 42542865 is about 6522.4891720876. The cubic root of 42542865 is about 349.0938874886.

The spelling of 42542865 in words is "forty-two million, five hundred forty-two thousand, eight hundred sixty-five".