642697 has 4 divisors (see below), whose sum is σ = 701136. Its totient is φ = 584260.

The previous prime is 642683. The next prime is 642701. The reversal of 642697 is 796246.

642697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 642697 - 2¹¹ = 640649 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 29203 + ... + 29224.

It is an arithmetic number, because the mean of its divisors is an integer number (175284).

2⁶⁴²⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

642697 is a deficient number, since it is larger than the sum of its proper divisors (58439).

642697 is a wasteful number, since it uses less digits than its factorization.

642697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58438.

The product of its digits is 18144, while the sum is 34.

The square root of 642697 is about 801.6838528996. The cubic root of 642697 is about 86.2982702567.

The spelling of 642697 in words is "six hundred forty-two thousand, six hundred ninety-seven".