6404920 has 32 divisors (see below), whose sum is σ = 15260400. Its totient is φ = 2411008.

The previous prime is 6404917. The next prime is 6404921. The reversal of 6404920 is 294046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404921) 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, 4030 + ... + 5389.

Almost surely, 2^6404920 is an apocalyptic number.

It is an amenable number.

6404920 is an abundant number, since it is smaller than the sum of its proper divisors (8855480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6404920 is a wasteful number, since it uses less digits than its factorization.

6404920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9447 (or 9443 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 6404920 is about 2530.7943417038. The cubic root of 6404920 is about 185.7111174438.

Adding to 6404920 its reverse (294046), we get a palindrome (6698966).

The spelling of 6404920 in words is "six million, four hundred four thousand, nine hundred twenty".