42891172 has 6 divisors (see below), whose sum is σ = 75059558. Its totient is φ = 21445584.

The previous prime is 42891143. The next prime is 42891181. The reversal of 42891172 is 27119824.

It can be written as a sum of positive squares in only one way, i.e., 41293476 + 1597696 = 6426^2 + 1264^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5361393 + ... + 5361400.

Almost surely, 2^42891172 is an apocalyptic number.

It is an amenable number.

42891172 is a deficient number, since it is larger than the sum of its proper divisors (32168386).

42891172 is a wasteful number, since it uses less digits than its factorization.

42891172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10722797 (or 10722795 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The square root of 42891172 is about 6549.1352100869. The cubic root of 42891172 is about 350.0439999105.

The spelling of 42891172 in words is "forty-two million, eight hundred ninety-one thousand, one hundred seventy-two".