42157172 has 6 divisors (see below), whose sum is σ = 73775058. Its totient is φ = 21078584.

The previous prime is 42157163. The next prime is 42157177. The reversal of 42157172 is 27175124.

It can be written as a sum of positive squares in only one way, i.e., 23872996 + 18284176 = 4886^2 + 4276^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42157177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5269643 + ... + 5269650.

It is an arithmetic number, because the mean of its divisors is an integer number (12295843).

Almost surely, 2^42157172 is an apocalyptic number.

It is an amenable number.

42157172 is a deficient number, since it is larger than the sum of its proper divisors (31617886).

42157172 is a wasteful number, since it uses less digits than its factorization.

42157172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10539297 (or 10539295 counting only the distinct ones).

The product of its digits is 3920, while the sum is 29.

The square root of 42157172 is about 6492.8554581170. The cubic root of 42157172 is about 348.0357232012.

The spelling of 42157172 in words is "forty-two million, one hundred fifty-seven thousand, one hundred seventy-two".