42172715 has 16 divisors (see below), whose sum is σ = 55163808. Its totient is φ = 30763776.

The previous prime is 42172673. The next prime is 42172717. The reversal of 42172715 is 51727124.

It is a cyclic number.

It is not a de Polignac number, because 42172715 - 2²² = 37978411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42172717) 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, 1487 + ... + 9303.

It is an arithmetic number, because the mean of its divisors is an integer number (3447738).

Almost surely, 2^42172715 is an apocalyptic number.

42172715 is a deficient number, since it is larger than the sum of its proper divisors (12991093).

42172715 is a wasteful number, since it uses less digits than its factorization.

42172715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7918.

The product of its digits is 3920, while the sum is 29.

The square root of 42172715 is about 6494.0522788164. The cubic root of 42172715 is about 348.0784905747.

Adding to 42172715 its reverse (51727124), we get a palindrome (93899839).

The spelling of 42172715 in words is "forty-two million, one hundred seventy-two thousand, seven hundred fifteen".