6401385 has 24 divisors (see below), whose sum is σ = 11681280. Its totient is φ = 3233952.

The previous prime is 6401377. The next prime is 6401387. The reversal of 6401385 is 5831046.

6401385 is a `hidden beast` number, since 640 + 13 + 8 + 5 = 666.

It is not a de Polignac number, because 6401385 - 2³ = 6401377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6401387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2889 + ... + 4598.

It is an arithmetic number, because the mean of its divisors is an integer number (486720).

Almost surely, 2^6401385 is an apocalyptic number.

It is an amenable number.

6401385 is a deficient number, since it is larger than the sum of its proper divisors (5279895).

6401385 is a wasteful number, since it uses less digits than its factorization.

6401385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7517 (or 7514 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 6401385 is about 2530.0958479868. The cubic root of 6401385 is about 185.6769452963.

It can be divided in two parts, 6401 and 385, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 6401385 in words is "six million, four hundred one thousand, three hundred eighty-five".