647142 has 8 divisors (see below), whose sum is σ = 1294296. Its totient is φ = 215712.

The previous prime is 647131. The next prime is 647147. The reversal of 647142 is 241746.

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

647142 is an admirable number.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647142.

It is not an unprimeable number, because it can be changed into a prime (647147) 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, 53923 + ... + 53934.

It is an arithmetic number, because the mean of its divisors is an integer number (161787).

2⁶⁴⁷¹⁴² is an apocalyptic number.

647142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647142 is a wasteful number, since it uses less digits than its factorization.

647142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107862.

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

The square root of 647142 is about 804.4513658389. The cubic root of 647142 is about 86.4967644440.

Adding to 647142 its reverse (241746), we get a palindrome (888888).

The spelling of 647142 in words is "six hundred forty-seven thousand, one hundred forty-two".