42865831 has 4 divisors (see below), whose sum is σ = 42907000. Its totient is φ = 42824664.

The previous prime is 42865829. The next prime is 42865841. The reversal of 42865831 is 13856824.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42865831 - 2¹ = 42865829 is a prime.

It is a super-2 number, since 2×42865831² = 3674958934641122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42865811) 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, 18981 + ... + 21118.

It is an arithmetic number, because the mean of its divisors is an integer number (10726750).

Almost surely, 2^42865831 is an apocalyptic number.

42865831 is a deficient number, since it is larger than the sum of its proper divisors (41169).

42865831 is a wasteful number, since it uses less digits than its factorization.

42865831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41168.

The product of its digits is 46080, while the sum is 37.

The square root of 42865831 is about 6547.2002413245. The cubic root of 42865831 is about 349.9750485614.

The spelling of 42865831 in words is "forty-two million, eight hundred sixty-five thousand, eight hundred thirty-one".