641340 has 72 divisors (see below), whose sum is σ = 2227680. Its totient is φ = 146304.

The previous prime is 641327. The next prime is 641371. The reversal of 641340 is 43146.

641340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641340² = 822633991200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

641340 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1006 + ... + 1514.

It is an arithmetic number, because the mean of its divisors is an integer number (30940).

2⁶⁴¹³⁴⁰ is an apocalyptic number.

641340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1113840).

641340 is an abundant number, since it is smaller than the sum of its proper divisors (1586340).

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

641340 is a wasteful number, since it uses less digits than its factorization.

641340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 526 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 641340 is about 800.8370620794. The cubic root of 641340 is about 86.2374903092.

Adding to 641340 its reverse (43146), we get a palindrome (684486).

The spelling of 641340 in words is "six hundred forty-one thousand, three hundred forty".