42172689 has 8 divisors (see below), whose sum is σ = 60555712. Its totient is φ = 25952400.

The previous prime is 42172673. The next prime is 42172717. The reversal of 42172689 is 98627124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42172689 - 2⁴ = 42172673 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1081351 = 42172689 / (4 + 2 + 1 + 7 + 2 + 6 + 8 + 9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42176689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540637 + ... + 540714.

It is an arithmetic number, because the mean of its divisors is an integer number (7569464).

Almost surely, 2^42172689 is an apocalyptic number.

It is an amenable number.

42172689 is a deficient number, since it is larger than the sum of its proper divisors (18383023).

42172689 is a wasteful number, since it uses less digits than its factorization.

42172689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081367.

The product of its digits is 48384, while the sum is 39.

The square root of 42172689 is about 6494.0502769843. The cubic root of 42172689 is about 348.0784190431.

The spelling of 42172689 in words is "forty-two million, one hundred seventy-two thousand, six hundred eighty-nine".