42986 has 4 divisors (see below), whose sum is σ = 64482. Its totient is φ = 21492.

The previous prime is 42979. The next prime is 42989. The reversal of 42986 is 68924.

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

It can be written as a sum of positive squares in only one way, i.e., 42025 + 961 = 205^2 + 31^2 .

It is not an unprimeable number, because it can be changed into a prime (42989) by changing a digit.

42986 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10745 + ... + 10748.

2⁴²⁹⁸⁶ is an apocalyptic number.

42986 is a deficient number, since it is larger than the sum of its proper divisors (21496).

42986 is a wasteful number, since it uses less digits than its factorization.

42986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21495.

The product of its digits is 3456, while the sum is 29.

The square root of 42986 is about 207.3306537876. The cubic root of 42986 is about 35.0301780537.

It can be divided in two parts, 429 and 86, that added together give a palindrome (515).

The spelling of 42986 in words is "forty-two thousand, nine hundred eighty-six".