6404851 has 4 divisors (see below), whose sum is σ = 6411312. Its totient is φ = 6398392.

The previous prime is 6404837. The next prime is 6404873. The reversal of 6404851 is 1584046.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1584046 = 2 ⋅792023.

It is a cyclic number.

It is not a de Polignac number, because 6404851 - 2⁵ = 6404819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6404551) 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, 1396 + ... + 3841.

It is an arithmetic number, because the mean of its divisors is an integer number (1602828).

Almost surely, 2^6404851 is an apocalyptic number.

6404851 is a deficient number, since it is larger than the sum of its proper divisors (6461).

6404851 is a wasteful number, since it uses less digits than its factorization.

6404851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6460.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 6404851 is about 2530.7807095835. The cubic root of 6404851 is about 185.7104505548.

Adding to 6404851 its reverse (1584046), we get a palindrome (7988897).

The spelling of 6404851 in words is "six million, four hundred four thousand, eight hundred fifty-one".