6403860 has 120 divisors (see below), whose sum is σ = 20734560. Its totient is φ = 1653696.

The previous prime is 6403853. The next prime is 6403877. The reversal of 6403860 is 683046.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 95547 + ... + 95613.

It is an arithmetic number, because the mean of its divisors is an integer number (172788).

Almost surely, 2^6403860 is an apocalyptic number.

6403860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6403860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10367280).

6403860 is an abundant number, since it is smaller than the sum of its proper divisors (14330700).

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

6403860 is a wasteful number, since it uses less digits than its factorization.

6403860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6403860 is about 2530.5849126240. The cubic root of 6403860 is about 185.7008719531.

The spelling of 6403860 in words is "six million, four hundred three thousand, eight hundred sixty".