641389 has 8 divisors (see below), whose sum is σ = 745920. Its totient is φ = 540096.

The previous prime is 641387. The next prime is 641411. The reversal of 641389 is 983146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641389 - 2¹ = 641387 is a prime.

It is a super-2 number, since 2×641389² = 822759698642, which contains 22 as substring.

It is a plaindrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 641389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641387) 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 7 ways as a sum of consecutive naturals, for example, 364 + ... + 1189.

It is an arithmetic number, because the mean of its divisors is an integer number (93240).

2⁶⁴¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

641389 is a deficient number, since it is larger than the sum of its proper divisors (104531).

641389 is a wasteful number, since it uses less digits than its factorization.

641389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619.

The product of its digits is 5184, while the sum is 31.

The square root of 641389 is about 800.8676544848. The cubic root of 641389 is about 86.2396865075.

The spelling of 641389 in words is "six hundred forty-one thousand, three hundred eighty-nine".