646436 has 12 divisors (see below), whose sum is σ = 1292928. Its totient is φ = 277032.

The previous prime is 646433. The next prime is 646453. The reversal of 646436 is 634646.

646436 = T₃₉₈ + T₃₉₉ + ... + T₄₀₅.

646436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

646436 is an admirable number.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 646399 and 646408.

It is not an unprimeable number, because it can be changed into a prime (646433) 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, 11516 + ... + 11571.

It is an arithmetic number, because the mean of its divisors is an integer number (107744).

2⁶⁴⁶⁴³⁶ is an apocalyptic number.

It is an amenable number.

646436 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

646436 is a wasteful number, since it uses less digits than its factorization.

646436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23098 (or 23096 counting only the distinct ones).

The product of its digits is 10368, while the sum is 29.

The square root of 646436 is about 804.0124377147. The cubic root of 646436 is about 86.4652984308.

The spelling of 646436 in words is "six hundred forty-six thousand, four hundred thirty-six".