6404429 has 4 divisors (see below), whose sum is σ = 6414780. Its totient is φ = 6394080.

The previous prime is 6404407. The next prime is 6404449. The reversal of 6404429 is 9244046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4368100 + 2036329 = 2090^2 + 1427^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6404429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404449) 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, 4184 + ... + 5505.

It is an arithmetic number, because the mean of its divisors is an integer number (1603695).

Almost surely, 2^6404429 is an apocalyptic number.

It is an amenable number.

6404429 is a deficient number, since it is larger than the sum of its proper divisors (10351).

6404429 is an equidigital number, since it uses as much as digits as its factorization.

6404429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10350.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 6404429 is about 2530.6973347281. The cubic root of 6404429 is about 185.7063717958.

The spelling of 6404429 in words is "six million, four hundred four thousand, four hundred twenty-nine".