646342 has 16 divisors (see below), whose sum is σ = 1038960. Its totient is φ = 300672.

The previous prime is 646339. The next prime is 646379. The reversal of 646342 is 243646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2658 + ... + 2890.

It is an arithmetic number, because the mean of its divisors is an integer number (64935).

2⁶⁴⁶³⁴² is an apocalyptic number.

646342 is a deficient number, since it is larger than the sum of its proper divisors (392618).

646342 is a wasteful number, since it uses less digits than its factorization.

646342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327.

The product of its digits is 3456, while the sum is 25.

The square root of 646342 is about 803.9539787824. The cubic root of 646342 is about 86.4611071770.

Adding to 646342 its reverse (243646), we get a palindrome (889988).

The spelling of 646342 in words is "six hundred forty-six thousand, three hundred forty-two".