641385 has 16 divisors (see below), whose sum is σ = 1140480. Its totient is φ = 342000.

The previous prime is 641371. The next prime is 641387. The reversal of 641385 is 583146.

641385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641385 - 2⁸ = 641129 is a prime.

It is a super-2 number, since 2×641385² = 822749436450, which contains 22 as substring.

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

641385 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (641387) 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, 2241 + ... + 2510.

It is an arithmetic number, because the mean of its divisors is an integer number (71280).

2⁶⁴¹³⁸⁵ is an apocalyptic number.

It is an amenable number.

641385 is a deficient number, since it is larger than the sum of its proper divisors (499095).

641385 is a wasteful number, since it uses less digits than its factorization.

641385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765 (or 4759 counting only the distinct ones).

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

The square root of 641385 is about 800.8651571894. The cubic root of 641385 is about 86.2395072302.

The spelling of 641385 in words is "six hundred forty-one thousand, three hundred eighty-five".