42986861 has 4 divisors (see below), whose sum is σ = 43021500. Its totient is φ = 42952224.

The previous prime is 42986843. The next prime is 42986899. The reversal of 42986861 is 16868924.

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 39062500 + 3924361 = 6250^2 + 1981^2 .

It is a cyclic number.

It is not a de Polignac number, because 42986861 - 2²² = 38792557 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 (42986261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15386 + ... + 17963.

It is an arithmetic number, because the mean of its divisors is an integer number (10755375).

Almost surely, 2^42986861 is an apocalyptic number.

It is an amenable number.

42986861 is a deficient number, since it is larger than the sum of its proper divisors (34639).

42986861 is a wasteful number, since it uses less digits than its factorization.

42986861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34638.

The product of its digits is 165888, while the sum is 44.

The square root of 42986861 is about 6556.4366084025. The cubic root of 42986861 is about 350.3041193439.

The spelling of 42986861 in words is "forty-two million, nine hundred eighty-six thousand, eight hundred sixty-one".