611840 has 40 divisors (see below), whose sum is σ = 1473120. Its totient is φ = 243712.

The previous prime is 611839. The next prime is 611873. The reversal of 611840 is 48116.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

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 611840.

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, 2441 + ... + 2679.

It is an arithmetic number, because the mean of its divisors is an integer number (36828).

2⁶¹¹⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 611840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (736560).

611840 is an abundant number, since it is smaller than the sum of its proper divisors (861280).

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

611840 is an equidigital number, since it uses as much as digits as its factorization.

611840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 611840 is about 782.2020199411. The cubic root of 611840 is about 84.8944479891.

Adding to 611840 its reverse (48116), we get a palindrome (659956).

The spelling of 611840 in words is "six hundred eleven thousand, eight hundred forty".