42172036 has 27 divisors (see below), whose sum is σ = 78810277. Its totient is φ = 19741760.

The previous prime is 42172033. The next prime is 42172043. The reversal of 42172036 is 63027124.

The square root of 42172036 is 6494.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 32832900 + 9339136 = 5730^2 + 3056^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42172036.

It is not an unprimeable number, because it can be changed into a prime (42172033) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 220701 + ... + 220891.

Almost surely, 2^42172036 is an apocalyptic number.

42172036 is the 6494-th square number.

It is an amenable number.

42172036 is a deficient number, since it is larger than the sum of its proper divisors (36638241).

42172036 is a wasteful number, since it uses less digits than its factorization.

42172036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The cubic root of 42172036 is about 348.0766224904.

Multiplying 42172036 by its sum of digits (25), we get a square (1054300900 = 32470²).

The spelling of 42172036 in words is "forty-two million, one hundred seventy-two thousand, thirty-six".