641439 has 10 divisors (see below), whose sum is σ = 958320. Its totient is φ = 427572.

The previous prime is 641437. The next prime is 641441. The reversal of 641439 is 934146.

It is an interprime number because it is at equal distance from previous prime (641437) and next prime (641441).

It is not a de Polignac number, because 641439 - 2¹ = 641437 is a prime.

It is a super-2 number, since 2×641439² = 822887981442, which contains 22 as substring.

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

641439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641437) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3879 + ... + 4040.

It is an arithmetic number, because the mean of its divisors is an integer number (95832).

2⁶⁴¹⁴³⁹ is an apocalyptic number.

641439 is a deficient number, since it is larger than the sum of its proper divisors (316881).

641439 is an equidigital number, since it uses as much as digits as its factorization.

641439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7931 (or 7922 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 641439 is about 800.8988700204. The cubic root of 641439 is about 86.2419274108.

The spelling of 641439 in words is "six hundred forty-one thousand, four hundred thirty-nine".