642471 has 8 divisors (see below), whose sum is σ = 860544. Its totient is φ = 426360.

The previous prime is 642457. The next prime is 642487. The reversal of 642471 is 174246.

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

It is not a de Polignac number, because 642471 - 2⁶ = 642407 is a prime.

It is a super-3 number, since 3×642471³ = 795576309306759333, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642071) 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, 670 + ... + 1316.

It is an arithmetic number, because the mean of its divisors is an integer number (107568).

2⁶⁴²⁴⁷¹ is an apocalyptic number.

642471 is a deficient number, since it is larger than the sum of its proper divisors (218073).

642471 is a wasteful number, since it uses less digits than its factorization.

642471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981.

The product of its digits is 1344, while the sum is 24.

The square root of 642471 is about 801.5428871870. The cubic root of 642471 is about 86.2881536722.

The spelling of 642471 in words is "six hundred forty-two thousand, four hundred seventy-one".