42172168 has 8 divisors (see below), whose sum is σ = 79072830. Its totient is φ = 21086080.

The previous prime is 42172157. The next prime is 42172171. The reversal of 42172168 is 86127124.

It can be written as a sum of positive squares in only one way, i.e., 40678884 + 1493284 = 6378^2 + 1222^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2635753 + ... + 2635768.

Almost surely, 2^42172168 is an apocalyptic number.

It is an amenable number.

42172168 is a deficient number, since it is larger than the sum of its proper divisors (36900662).

42172168 is a wasteful number, since it uses less digits than its factorization.

42172168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5271527 (or 5271523 counting only the distinct ones).

The product of its digits is 5376, while the sum is 31.

The square root of 42172168 is about 6494.0101632196. The cubic root of 42172168 is about 348.0769856541.

The spelling of 42172168 in words is "forty-two million, one hundred seventy-two thousand, one hundred sixty-eight".