42012172 has 12 divisors (see below), whose sum is σ = 75085920. Its totient is φ = 20559056.

The previous prime is 42012163. The next prime is 42012203. The reversal of 42012172 is 27121024.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111547 + ... + 111922.

It is an arithmetic number, because the mean of its divisors is an integer number (6257160).

Almost surely, 2^42012172 is an apocalyptic number.

It is an amenable number.

42012172 is a deficient number, since it is larger than the sum of its proper divisors (33073748).

42012172 is a wasteful number, since it uses less digits than its factorization.

42012172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223520 (or 223518 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 42012172 is about 6481.6797205663. The cubic root of 42012172 is about 347.6362407662.

Adding to 42012172 its reverse (27121024), we get a palindrome (69133196).

The spelling of 42012172 in words is "forty-two million, twelve thousand, one hundred seventy-two".