646346 has 8 divisors (see below), whose sum is σ = 1011744. Its totient is φ = 309100.

The previous prime is 646339. The next prime is 646379. The reversal of 646346 is 643646.

646346 = 34² + 35² + ... + 125².

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

It is an Ulam number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 6980 + ... + 7071.

It is an arithmetic number, because the mean of its divisors is an integer number (126468).

2⁶⁴⁶³⁴⁶ is an apocalyptic number.

646346 is a deficient number, since it is larger than the sum of its proper divisors (365398).

646346 is a wasteful number, since it uses less digits than its factorization.

646346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14076.

The product of its digits is 10368, while the sum is 29.

The square root of 646346 is about 803.9564664831. The cubic root of 646346 is about 86.4612855365.

The spelling of 646346 in words is "six hundred forty-six thousand, three hundred forty-six".