646430 has 16 divisors (see below), whose sum is σ = 1175040. Its totient is φ = 256032.

The previous prime is 646423. The next prime is 646433. The reversal of 646430 is 34646.

It is a junction number, because it is equal to n+sod(n) for n = 646396 and 646405.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1016 + ... + 1524.

It is an arithmetic number, because the mean of its divisors is an integer number (73440).

2⁶⁴⁶⁴³⁰ is an apocalyptic number.

646430 is a deficient number, since it is larger than the sum of its proper divisors (528610).

646430 is a wasteful number, since it uses less digits than its factorization.

646430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 646430 is about 804.0087064205. The cubic root of 646430 is about 86.4650309161.

The spelling of 646430 in words is "six hundred forty-six thousand, four hundred thirty".