42172686 has 24 divisors (see below), whose sum is σ = 91573560. Its totient is φ = 14026896.

The previous prime is 42172673. The next prime is 42172717. The reversal of 42172686 is 68627124.

It is a self number, because there is not a number n which added to its sum of digits gives 42172686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6861 + ... + 11463.

It is an arithmetic number, because the mean of its divisors is an integer number (3815565).

Almost surely, 2^42172686 is an apocalyptic number.

42172686 is an abundant number, since it is smaller than the sum of its proper divisors (49400874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42172686 is a wasteful number, since it uses less digits than its factorization.

42172686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120 (or 5117 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 42172686 is about 6494.0500460036. The cubic root of 42172686 is about 348.0784107895.

It can be divided in two parts, 4217 and 2686, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 42172686 in words is "forty-two million, one hundred seventy-two thousand, six hundred eighty-six".