646129 has 8 divisors (see below), whose sum is σ = 711360. Its totient is φ = 582000.

The previous prime is 646103. The next prime is 646147. The reversal of 646129 is 921646.

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 646129 - 2¹³ = 637937 is a prime.

It is a Duffinian number.

646129 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 646097 and 646106.

It is not an unprimeable number, because it can be changed into a prime (646159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1467 + ... + 1855.

It is an arithmetic number, because the mean of its divisors is an integer number (88920).

2⁶⁴⁶¹²⁹ is an apocalyptic number.

It is an amenable number.

646129 is a deficient number, since it is larger than the sum of its proper divisors (65231).

646129 is a wasteful number, since it uses less digits than its factorization.

646129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its digits is 2592, while the sum is 28.

The square root of 646129 is about 803.8214975976. The cubic root of 646129 is about 86.4516084703.

The spelling of 646129 in words is "six hundred forty-six thousand, one hundred twenty-nine".