646429 has 4 divisors (see below), whose sum is σ = 738784. Its totient is φ = 554076.

The previous prime is 646423. The next prime is 646433. The reversal of 646429 is 924646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646429 - 2³ = 646421 is a prime.

It is a d-powerful number, because it can be written as 6² + 4² + 4⁷ + 6⁶ + 2¹⁹ + 9⁵ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646421) 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, 46167 + ... + 46180.

It is an arithmetic number, because the mean of its divisors is an integer number (184696).

2⁶⁴⁶⁴²⁹ is an apocalyptic number.

It is an amenable number.

646429 is a deficient number, since it is larger than the sum of its proper divisors (92355).

646429 is an equidigital number, since it uses as much as digits as its factorization.

646429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92354.

The product of its digits is 10368, while the sum is 31.

The square root of 646429 is about 804.0080845365. The cubic root of 646429 is about 86.4649863302.

The spelling of 646429 in words is "six hundred forty-six thousand, four hundred twenty-nine".