42231312 has 120 divisors (see below), whose sum is σ = 126741888. Its totient is φ = 13094400.

The previous prime is 42231311. The next prime is 42231323. The reversal of 42231312 is 21313224.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (42231311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135637 + ... + 135947.

Almost surely, 2^42231312 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 42231312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63370944).

42231312 is an abundant number, since it is smaller than the sum of its proper divisors (84510576).

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

42231312 is a wasteful number, since it uses less digits than its factorization.

42231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 380 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 42231312 is about 6498.5623025405. The cubic root of 42231312 is about 348.2396288526.

Adding to 42231312 its reverse (21313224), we get a palindrome (63544536).

The spelling of 42231312 in words is "forty-two million, two hundred thirty-one thousand, three hundred twelve".