42171706 has 4 divisors (see below), whose sum is σ = 63257562. Its totient is φ = 21085852.

The previous prime is 42171677. The next prime is 42171707. The reversal of 42171706 is 60717124.

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., 32592681 + 9579025 = 5709^2 + 3095^2 .

It is not an unprimeable number, because it can be changed into a prime (42171707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10542925 + ... + 10542928.

Almost surely, 2^42171706 is an apocalyptic number.

42171706 is a deficient number, since it is larger than the sum of its proper divisors (21085856).

42171706 is a wasteful number, since it uses less digits than its factorization.

42171706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21085855.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 42171706 is about 6493.9745918813. The cubic root of 42171706 is about 348.0757145776.

It can be divided in two parts, 421 and 71706, that added together give a palindrome (72127).

The spelling of 42171706 in words is "forty-two million, one hundred seventy-one thousand, seven hundred six".