646142 has 8 divisors (see below), whose sum is σ = 1107696. Its totient is φ = 276912.

The previous prime is 646103. The next prime is 646147. The reversal of 646142 is 241646.

It is a happy number.

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

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 646142.

It is not an unprimeable number, because it can be changed into a prime (646147) 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, 23063 + ... + 23090.

It is an arithmetic number, because the mean of its divisors is an integer number (138462).

2⁶⁴⁶¹⁴² is an apocalyptic number.

646142 is a deficient number, since it is larger than the sum of its proper divisors (461554).

646142 is a wasteful number, since it uses less digits than its factorization.

646142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46162.

The product of its digits is 1152, while the sum is 23.

The square root of 646142 is about 803.8295839293. The cubic root of 646142 is about 86.4521882634.

Adding to 646142 its reverse (241646), we get a palindrome (887788).

Subtracting from 646142 its reverse (241646), we obtain a square (404496 = 636²).

The spelling of 646142 in words is "six hundred forty-six thousand, one hundred forty-two".