642992 has 20 divisors (see below), whose sum is σ = 1424016. Its totient is φ = 275520.

The previous prime is 642977. The next prime is 642997. The reversal of 642992 is 299246.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

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 642992.

It is not an unprimeable number, because it can be changed into a prime (642997) by changing a digit.

642992 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2759 + ... + 2982.

2⁶⁴²⁹⁹² is an apocalyptic number.

It is an amenable number.

642992 is an abundant number, since it is smaller than the sum of its proper divisors (781024).

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

642992 is a wasteful number, since it uses less digits than its factorization.

642992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5756 (or 5750 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 642992 is about 801.8678195314. The cubic root of 642992 is about 86.3114719654.

The spelling of 642992 in words is "six hundred forty-two thousand, nine hundred ninety-two".