42447172 has 12 divisors (see below), whose sum is σ = 74505340. Its totient is φ = 21159936.

The previous prime is 42447161. The next prime is 42447179. The reversal of 42447172 is 27174424.

It can be written as a sum of positive squares in 2 ways, for example, as 18181696 + 24265476 = 4264^2 + 4926^2 .

It is not an unprimeable number, because it can be changed into a prime (42447179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14397 + ... + 17092.

Almost surely, 2^42447172 is an apocalyptic number.

It is an amenable number.

42447172 is a deficient number, since it is larger than the sum of its proper divisors (32058168).

42447172 is a wasteful number, since it uses less digits than its factorization.

42447172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31830 (or 31828 counting only the distinct ones).

The product of its digits is 12544, while the sum is 31.

The square root of 42447172 is about 6515.1494226917. The cubic root of 42447172 is about 348.8319483859.

The spelling of 42447172 in words is "forty-two million, four hundred forty-seven thousand, one hundred seventy-two".