42172427 has 16 divisors (see below), whose sum is σ = 49183200. Its totient is φ = 35735040.

The previous prime is 42172397. The next prime is 42172439. The reversal of 42172427 is 72427124.

It is not a de Polignac number, because 42172427 - 2⁸ = 42172171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42172427.

It is not an unprimeable number, because it can be changed into a prime (42172447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19349 + ... + 21417.

It is an arithmetic number, because the mean of its divisors is an integer number (3073950).

Almost surely, 2^42172427 is an apocalyptic number.

42172427 is a deficient number, since it is larger than the sum of its proper divisors (7010773).

42172427 is a wasteful number, since it uses less digits than its factorization.

42172427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206.

The product of its digits is 6272, while the sum is 29.

The square root of 42172427 is about 6494.0301046423. The cubic root of 42172427 is about 348.0776982233.

The spelling of 42172427 in words is "forty-two million, one hundred seventy-two thousand, four hundred twenty-seven".