42172312 has 64 divisors (see below), whose sum is σ = 99247680. Its totient is φ = 16353792.

The previous prime is 42172309. The next prime is 42172321. The reversal of 42172312 is 21327124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38038 + ... + 39130.

It is an arithmetic number, because the mean of its divisors is an integer number (1550745).

Almost surely, 2^42172312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42172312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49623840).

42172312 is an abundant number, since it is smaller than the sum of its proper divisors (57075368).

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

42172312 is a wasteful number, since it uses less digits than its factorization.

42172312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172 (or 1168 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 42172312 is about 6494.0212503502. The cubic root of 42172312 is about 348.0773818319.

Adding to 42172312 its reverse (21327124), we get a palindrome (63499436).

The spelling of 42172312 in words is "forty-two million, one hundred seventy-two thousand, three hundred twelve".