642693 has 8 divisors (see below), whose sum is σ = 861088. Its totient is φ = 426384.

The previous prime is 642683. The next prime is 642701. The reversal of 642693 is 396246.

642693 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-642693 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 642693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642613) 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, 471 + ... + 1227.

It is an arithmetic number, because the mean of its divisors is an integer number (107636).

2⁶⁴²⁶⁹³ is an apocalyptic number.

It is an amenable number.

642693 is a deficient number, since it is larger than the sum of its proper divisors (218395).

642693 is a wasteful number, since it uses less digits than its factorization.

642693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043.

The product of its digits is 7776, while the sum is 30.

The square root of 642693 is about 801.6813581467. The cubic root of 642693 is about 86.2980912228.

The spelling of 642693 in words is "six hundred forty-two thousand, six hundred ninety-three".