646386 has 16 divisors (see below), whose sum is σ = 1392384. Its totient is φ = 198864.

The previous prime is 646379. The next prime is 646397. The reversal of 646386 is 683646.

It is a congruent number.

It is an unprimeable number.

646386 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4066 + ... + 4221.

It is an arithmetic number, because the mean of its divisors is an integer number (87024).

2⁶⁴⁶³⁸⁶ is an apocalyptic number.

646386 is an abundant number, since it is smaller than the sum of its proper divisors (745998).

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

646386 is a wasteful number, since it uses less digits than its factorization.

646386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8305.

The product of its digits is 20736, while the sum is 33.

The square root of 646386 is about 803.9813430671. The cubic root of 646386 is about 86.4630690911.

The spelling of 646386 in words is "six hundred forty-six thousand, three hundred eighty-six".