42755985 has 64 divisors (see below), whose sum is σ = 81408000. Its totient is φ = 21228480.

The previous prime is 42755981. The next prime is 42756031. The reversal of 42755985 is 58955724.

It is not a de Polignac number, because 42755985 - 2² = 42755981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42755985.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42755981) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 202530 + ... + 202740.

It is an arithmetic number, because the mean of its divisors is an integer number (1272000).

Almost surely, 2^42755985 is an apocalyptic number.

42755985 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42755985 is a deficient number, since it is larger than the sum of its proper divisors (38652015).

42755985 is a wasteful number, since it uses less digits than its factorization.

42755985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 317 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The square root of 42755985 is about 6538.8060836822. The cubic root of 42755985 is about 349.6758495425.

The spelling of 42755985 in words is "forty-two million, seven hundred fifty-five thousand, nine hundred eighty-five".