646123 has 8 divisors (see below), whose sum is σ = 671328. Its totient is φ = 621504.

The previous prime is 646103. The next prime is 646147. The reversal of 646123 is 321646.

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 646123 - 2⁹ = 645611 is a prime.

It is a super-2 number, since 2×646123² = 834949862258, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646094 and 646103.

It is not an unprimeable number, because it can be changed into a prime (646103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3786 + ... + 3952.

It is an arithmetic number, because the mean of its divisors is an integer number (83916).

2⁶⁴⁶¹²³ is an apocalyptic number.

646123 is a deficient number, since it is larger than the sum of its proper divisors (25205).

646123 is a wasteful number, since it uses less digits than its factorization.

646123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293.

The product of its digits is 864, while the sum is 22.

The square root of 646123 is about 803.8177654170. The cubic root of 646123 is about 86.4513408709.

Adding to 646123 its reverse (321646), we get a palindrome (967769).

The spelling of 646123 in words is "six hundred forty-six thousand, one hundred twenty-three".