42543873 has 20 divisors (see below), whose sum is σ = 65607168. Its totient is φ = 27446040.

The previous prime is 42543863. The next prime is 42543881. The reversal of 42543873 is 37834524.

It is a happy number.

42543873 is a `hidden beast` number, since 42 + 543 + 8 + 73 = 666.

It is not a de Polignac number, because 42543873 - 2⁸ = 42543617 is a prime.

It is a super-2 number, since 2×42543873² = 3619962259680258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42543803) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5961 + ... + 10982.

Almost surely, 2^42543873 is an apocalyptic number.

It is an amenable number.

42543873 is a deficient number, since it is larger than the sum of its proper divisors (23063295).

42543873 is a wasteful number, since it uses less digits than its factorization.

42543873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16986 (or 16977 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 42543873 is about 6522.5664427432. The cubic root of 42543873 is about 349.0966445813.

The spelling of 42543873 in words is "forty-two million, five hundred forty-three thousand, eight hundred seventy-three".