641438 has 8 divisors (see below), whose sum is σ = 1099632. Its totient is φ = 274896.

The previous prime is 641437. The next prime is 641441. The reversal of 641438 is 834146.

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

It is a super-2 number, since 2×641438² = 822885415688, which contains 22 as substring.

It is a Curzon 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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22895 + ... + 22922.

It is an arithmetic number, because the mean of its divisors is an integer number (137454).

2⁶⁴¹⁴³⁸ is an apocalyptic number.

641438 is a deficient number, since it is larger than the sum of its proper divisors (458194).

641438 is a wasteful number, since it uses less digits than its factorization.

641438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45826.

The product of its digits is 2304, while the sum is 26.

The square root of 641438 is about 800.8982457216. The cubic root of 641438 is about 86.2418825939.

The spelling of 641438 in words is "six hundred forty-one thousand, four hundred thirty-eight".