646172 has 6 divisors (see below), whose sum is σ = 1130808. Its totient is φ = 323084.

The previous prime is 646169. The next prime is 646181. The reversal of 646172 is 271646.

646172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646172.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80768 + ... + 80775.

It is an arithmetic number, because the mean of its divisors is an integer number (188468).

2⁶⁴⁶¹⁷² is an apocalyptic number.

It is an amenable number.

646172 is a deficient number, since it is larger than the sum of its proper divisors (484636).

646172 is a wasteful number, since it uses less digits than its factorization.

646172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161547 (or 161545 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 646172 is about 803.8482443845. The cubic root of 646172 is about 86.4535262178.

It can be divided in two parts, 646 and 172, that added together give a palindrome (818).

The spelling of 646172 in words is "six hundred forty-six thousand, one hundred seventy-two".