641408 has 16 divisors (see below), whose sum is σ = 1278060. Its totient is φ = 320640.

The previous prime is 641387. The next prime is 641411. The reversal of 641408 is 804146.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×641408² = 822808444928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2378 + ... + 2633.

2⁶⁴¹⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

641408 is a deficient number, since it is larger than the sum of its proper divisors (636652).

641408 is an equidigital number, since it uses as much as digits as its factorization.

641408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5025 (or 5013 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 641408 is about 800.8795165317. The cubic root of 641408 is about 86.2405380645.

It can be divided in two parts, 6 and 41408, that added together give a palindrome (41414).

The spelling of 641408 in words is "six hundred forty-one thousand, four hundred eight".