642371 has 4 divisors (see below), whose sum is σ = 676200. Its totient is φ = 608544.

The previous prime is 642361. The next prime is 642373. The reversal of 642371 is 173246.

642371 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642373) 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, 16886 + ... + 16923.

It is an arithmetic number, because the mean of its divisors is an integer number (169050).

2⁶⁴²³⁷¹ is an apocalyptic number.

642371 is a deficient number, since it is larger than the sum of its proper divisors (33829).

642371 is a wasteful number, since it uses less digits than its factorization.

642371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33828.

The product of its digits is 1008, while the sum is 23.

The square root of 642371 is about 801.4805050655. The cubic root of 642371 is about 86.2836765502.

The spelling of 642371 in words is "six hundred forty-two thousand, three hundred seventy-one".