642312 has 48 divisors (see below), whose sum is σ = 1900080. Its totient is φ = 194400.

The previous prime is 642281. The next prime is 642359. The reversal of 642312 is 213246.

It is a happy number.

642312 is nontrivially palindromic in base 15.

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 a d-powerful number, because it can be written as 6² + 4⁸ + 3⁹ + 2¹⁵ + 1 + 2¹⁹ .

It is an unprimeable number.

642312 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 387 + ... + 1197.

It is an arithmetic number, because the mean of its divisors is an integer number (39585).

2⁶⁴²³¹² 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 642312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (950040).

642312 is an abundant number, since it is smaller than the sum of its proper divisors (1257768).

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

642312 is a wasteful number, since it uses less digits than its factorization.

642312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834 (or 827 counting only the distinct ones).

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

The square root of 642312 is about 801.4436973363. The cubic root of 642312 is about 86.2810348303.

Adding to 642312 its reverse (213246), we get a palindrome (855558).

The spelling of 642312 in words is "six hundred forty-two thousand, three hundred twelve".