6401820 has 48 divisors (see below), whose sum is σ = 18708480. Its totient is φ = 1632576.

The previous prime is 6401771. The next prime is 6401827. The reversal of 6401820 is 281046.

6401820 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940 + ... + 3699.

It is an arithmetic number, because the mean of its divisors is an integer number (389760).

Almost surely, 2^6401820 is an apocalyptic number.

6401820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6401820 is an abundant number, since it is smaller than the sum of its proper divisors (12306660).

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

6401820 is a wasteful number, since it uses less digits than its factorization.

6401820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4674 (or 4672 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 6401820 is about 2530.1818116491. The cubic root of 6401820 is about 185.6811510342.

Adding to 6401820 its reverse (281046), we get a palindrome (6682866).

The spelling of 6401820 in words is "six million, four hundred one thousand, eight hundred twenty".