42865189 has 4 divisors (see below), whose sum is σ = 42930700. Its totient is φ = 42799680.

The previous prime is 42865187. The next prime is 42865217. The reversal of 42865189 is 98156824.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26728900 + 16136289 = 5170^2 + 4017^2 .

It is a cyclic number.

It is not a de Polignac number, because 42865189 - 2¹ = 42865187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42865187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31764 + ... + 33085.

It is an arithmetic number, because the mean of its divisors is an integer number (10732675).

Almost surely, 2^42865189 is an apocalyptic number.

It is an amenable number.

42865189 is a deficient number, since it is larger than the sum of its proper divisors (65511).

42865189 is an equidigital number, since it uses as much as digits as its factorization.

42865189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65510.

The product of its digits is 138240, while the sum is 43.

The square root of 42865189 is about 6547.1512125504. The cubic root of 42865189 is about 349.9733013648.

The spelling of 42865189 in words is "forty-two million, eight hundred sixty-five thousand, one hundred eighty-nine".