646834 has 8 divisors (see below), whose sum is σ = 996588. Its totient is φ = 314640.

The previous prime is 646831. The next prime is 646837. The reversal of 646834 is 438646.

It is an interprime number because it is at equal distance from previous prime (646831) and next prime (646837).

It can be written as a sum of positive squares in 2 ways, for example, as 644809 + 2025 = 803^2 + 45^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 646796 and 646805.

It is not an unprimeable number, because it can be changed into a prime (646831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4297 + ... + 4444.

2⁶⁴⁶⁸³⁴ is an apocalyptic number.

646834 is a deficient number, since it is larger than the sum of its proper divisors (349754).

646834 is a wasteful number, since it uses less digits than its factorization.

646834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8780.

The product of its digits is 13824, while the sum is 31.

The square root of 646834 is about 804.2599082386. The cubic root of 646834 is about 86.4830398771.

It can be divided in two parts, 6468 and 34, that multiplied together give a palindrome (219912).

The spelling of 646834 in words is "six hundred forty-six thousand, eight hundred thirty-four".