646893 has 32 divisors (see below), whose sum is σ = 1097600. Its totient is φ = 373248.

The previous prime is 646889. The next prime is 646897. The reversal of 646893 is 398646.

646893 is a `hidden beast` number, since 646 + 8 + 9 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (646889) and next prime (646897).

It is not a de Polignac number, because 646893 - 2² = 646889 is a prime.

It is a Duffinian number.

646893 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646897) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6621 + ... + 6717.

It is an arithmetic number, because the mean of its divisors is an integer number (34300).

2⁶⁴⁶⁸⁹³ is an apocalyptic number.

It is an amenable number.

646893 is a deficient number, since it is larger than the sum of its proper divisors (450707).

646893 is a wasteful number, since it uses less digits than its factorization.

646893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 132 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 646893 is about 804.2965870871. The cubic root of 646893 is about 86.4856692710.

It can be divided in two parts, 6468 and 93, that added together give a 8-th power (6561 = 3⁸).

The spelling of 646893 in words is "six hundred forty-six thousand, eight hundred ninety-three".