642967 has 4 divisors (see below), whose sum is σ = 692440. Its totient is φ = 593496.

The previous prime is 642953. The next prime is 642973. The reversal of 642967 is 769246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 769246 = 2 ⋅384623.

It is a cyclic number.

It is not a de Polignac number, because 642967 - 2¹¹ = 640919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24717 + ... + 24742.

It is an arithmetic number, because the mean of its divisors is an integer number (173110).

2⁶⁴²⁹⁶⁷ is an apocalyptic number.

642967 is a deficient number, since it is larger than the sum of its proper divisors (49473).

642967 is a wasteful number, since it uses less digits than its factorization.

642967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49472.

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

The square root of 642967 is about 801.8522307757. The cubic root of 642967 is about 86.3103533331.

The spelling of 642967 in words is "six hundred forty-two thousand, nine hundred sixty-seven".