646369 has 8 divisors (see below), whose sum is σ = 682560. Its totient is φ = 610896.

The previous prime is 646339. The next prime is 646379. The reversal of 646369 is 963646.

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

It is a cyclic number.

It is not a de Polignac number, because 646369 - 2⁹ = 645857 is a prime.

It is a super-2 number, since 2×646369² = 835585768322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646309) by changing a digit.

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, 3522 + ... + 3700.

It is an arithmetic number, because the mean of its divisors is an integer number (85320).

2⁶⁴⁶³⁶⁹ is an apocalyptic number.

It is an amenable number.

646369 is a deficient number, since it is larger than the sum of its proper divisors (36191).

646369 is a wasteful number, since it uses less digits than its factorization.

646369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359.

The product of its digits is 23328, while the sum is 34.

The square root of 646369 is about 803.9707706130. The cubic root of 646369 is about 86.4623110894.

The spelling of 646369 in words is "six hundred forty-six thousand, three hundred sixty-nine".