643374 has 24 divisors (see below), whose sum is σ = 1440192. Its totient is φ = 207360.

The previous prime is 643373. The next prime is 643403. The reversal of 643374 is 473346.

643374 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 643374.

It is not an unprimeable number, because it can be changed into a prime (643373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19 + ... + 1134.

It is an arithmetic number, because the mean of its divisors is an integer number (60008).

2⁶⁴³³⁷⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643374, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (720096).

643374 is an abundant number, since it is smaller than the sum of its proper divisors (796818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643374 is a wasteful number, since it uses less digits than its factorization.

643374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1189 counting only the distinct ones).

The product of its digits is 6048, while the sum is 27.

The square root of 643374 is about 802.1059780353. The cubic root of 643374 is about 86.3285610609.

The spelling of 643374 in words is "six hundred forty-three thousand, three hundred seventy-four".