642192 has 40 divisors (see below), whose sum is σ = 1758816. Its totient is φ = 201216.

The previous prime is 642163. The next prime is 642197. The reversal of 642192 is 291246.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423 + ... + 1209.

2⁶⁴²¹⁹² 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 642192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (879408).

642192 is an abundant number, since it is smaller than the sum of its proper divisors (1116624).

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

642192 is a wasteful number, since it uses less digits than its factorization.

642192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815 (or 809 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 642192 is about 801.3688289421. The cubic root of 642192 is about 86.2756613415.

The spelling of 642192 in words is "six hundred forty-two thousand, one hundred ninety-two".