42172305 has 32 divisors (see below), whose sum is σ = 81177600. Its totient is φ = 18263232.

The previous prime is 42172303. The next prime is 42172309. The reversal of 42172305 is 50327124.

It is not a de Polignac number, because 42172305 - 2¹ = 42172303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42172303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8575 + ... + 12564.

It is an arithmetic number, because the mean of its divisors is an integer number (2536800).

Almost surely, 2^42172305 is an apocalyptic number.

It is an amenable number.

42172305 is a deficient number, since it is larger than the sum of its proper divisors (39005295).

42172305 is a wasteful number, since it uses less digits than its factorization.

42172305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21173.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 42172305 is about 6494.0207113929. The cubic root of 42172305 is about 348.0773625733.

Adding to 42172305 its reverse (50327124), we get a palindrome (92499429).

The spelling of 42172305 in words is "forty-two million, one hundred seventy-two thousand, three hundred five".