42871786 has 4 divisors (see below), whose sum is σ = 64307682. Its totient is φ = 21435892.

The previous prime is 42871781. The next prime is 42871811. The reversal of 42871786 is 68717824.

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., 34281025 + 8590761 = 5855^2 + 2931^2 .

It is not an unprimeable number, because it can be changed into a prime (42871781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717945 + ... + 10717948.

Almost surely, 2^42871786 is an apocalyptic number.

42871786 is a deficient number, since it is larger than the sum of its proper divisors (21435896).

42871786 is a wasteful number, since it uses less digits than its factorization.

42871786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21435895.

The product of its digits is 150528, while the sum is 43.

The square root of 42871786 is about 6547.6550000745. The cubic root of 42871786 is about 349.9912542032.

The spelling of 42871786 in words is "forty-two million, eight hundred seventy-one thousand, seven hundred eighty-six".