642793 has 4 divisors (see below), whose sum is σ = 644688. Its totient is φ = 640900.

The previous prime is 642791. The next prime is 642797. The reversal of 642793 is 397246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 397246 = 2 ⋅198623.

It is a cyclic number.

It is not a de Polignac number, because 642793 - 2¹ = 642791 is a prime.

It is a d-powerful number, because it can be written as 6² + 4³ + 7⁶ + 2¹⁹ + 9³ + 3³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283 + ... + 1168.

It is an arithmetic number, because the mean of its divisors is an integer number (161172).

2⁶⁴²⁷⁹³ is an apocalyptic number.

It is an amenable number.

642793 is a deficient number, since it is larger than the sum of its proper divisors (1895).

642793 is a wasteful number, since it uses less digits than its factorization.

642793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894.

The product of its digits is 9072, while the sum is 31.

The square root of 642793 is about 801.7437246402. The cubic root of 642793 is about 86.3025668493.

The spelling of 642793 in words is "six hundred forty-two thousand, seven hundred ninety-three".