6401605 has 48 divisors (see below), whose sum is σ = 9972720. Its totient is φ = 3913728.

The previous prime is 6401587. The next prime is 6401609. The reversal of 6401605 is 5061046.

It can be written as a sum of positive squares in 8 ways, for example, as 261121 + 6140484 = 511^2 + 2478^2 .

It is not a de Polignac number, because 6401605 - 2⁷ = 6401477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401609) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 120759 + ... + 120811.

It is an arithmetic number, because the mean of its divisors is an integer number (207765).

Almost surely, 2^6401605 is an apocalyptic number.

It is an amenable number.

6401605 is a deficient number, since it is larger than the sum of its proper divisors (3571115).

6401605 is a wasteful number, since it uses less digits than its factorization.

6401605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 6401605 is about 2530.1393242270. The cubic root of 6401605 is about 185.6790723600.

The spelling of 6401605 in words is "six million, four hundred one thousand, six hundred five".