42172518 has 32 divisors (see below), whose sum is σ = 86873472. Its totient is φ = 13640000.

The previous prime is 42172511. The next prime is 42172519. The reversal of 42172518 is 81527124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42172511) 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, 61405 + ... + 62087.

It is an arithmetic number, because the mean of its divisors is an integer number (2714796).

Almost surely, 2^42172518 is an apocalyptic number.

42172518 is an abundant number, since it is smaller than the sum of its proper divisors (44700954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42172518 is a wasteful number, since it uses less digits than its factorization.

42172518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980.

The product of its digits is 4480, while the sum is 30.

The square root of 42172518 is about 6494.0371110735. The cubic root of 42172518 is about 348.0779485847.

The spelling of 42172518 in words is "forty-two million, one hundred seventy-two thousand, five hundred eighteen".