642392 has 16 divisors (see below), whose sum is σ = 1225800. Its totient is φ = 315520.

The previous prime is 642373. The next prime is 642403. The reversal of 642392 is 293246.

642392 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6² + 4⁸ + 3⁹ + 2¹⁵ + 9² + 2¹⁹ .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642392.

It is an unprimeable number.

642392 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 3 ways as a sum of consecutive naturals, for example, 209 + ... + 1152.

2⁶⁴²³⁹² is an apocalyptic number.

It is an amenable number.

642392 is a deficient number, since it is larger than the sum of its proper divisors (583408).

642392 is a wasteful number, since it uses less digits than its factorization.

642392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 1422 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

The square root of 642392 is about 801.4936057137. The cubic root of 642392 is about 86.2846167844.

The spelling of 642392 in words is "six hundred forty-two thousand, three hundred ninety-two".