641738 has 8 divisors (see below), whose sum is σ = 983232. Its totient is φ = 313996.

The previous prime is 641713. The next prime is 641747. The reversal of 641738 is 837146.

641738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 641738.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641738.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3320 + ... + 3507.

It is an arithmetic number, because the mean of its divisors is an integer number (122904).

2⁶⁴¹⁷³⁸ is an apocalyptic number.

641738 is a deficient number, since it is larger than the sum of its proper divisors (341494).

641738 is a wasteful number, since it uses less digits than its factorization.

641738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876.

The product of its digits is 4032, while the sum is 29.

The square root of 641738 is about 801.0855135377. The cubic root of 641738 is about 86.2553255831.

The spelling of 641738 in words is "six hundred forty-one thousand, seven hundred thirty-eight".