42865785 has 12 divisors (see below), whose sum is σ = 74300772. Its totient is φ = 22861728.

The previous prime is 42865769. The next prime is 42865807. The reversal of 42865785 is 58756824.

It can be written as a sum of positive squares in 2 ways, for example, as 12362256 + 30503529 = 3516^2 + 5523^2 .

It is not a de Polignac number, because 42865785 - 2⁴ = 42865769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 952573 = 42865785 / (4 + 2 + 8 + 6 + 5 + 7 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 42865785.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 476242 + ... + 476331.

It is an arithmetic number, because the mean of its divisors is an integer number (6191731).

Almost surely, 2^42865785 is an apocalyptic number.

42865785 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42865785 is a deficient number, since it is larger than the sum of its proper divisors (31434987).

42865785 is a wasteful number, since it uses less digits than its factorization.

42865785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952584 (or 952581 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 42865785 is about 6547.1967283716. The cubic root of 42865785 is about 349.9749233734.

The spelling of 42865785 in words is "forty-two million, eight hundred sixty-five thousand, seven hundred eighty-five".