618840 has 80 divisors (see below), whose sum is σ = 2090880. Its totient is φ = 164160.

The previous prime is 618833. The next prime is 618841. The reversal of 618840 is 48816.

618840 is a `hidden beast` number, since 618 + 8 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618841) by changing a digit.

618840 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 19 ways as a sum of consecutive naturals, for example, 3145 + ... + 3335.

It is an arithmetic number, because the mean of its divisors is an integer number (26136).

2⁶¹⁸⁸⁴⁰ is an apocalyptic number.

618840 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 618840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045440).

618840 is an abundant number, since it is smaller than the sum of its proper divisors (1472040).

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

618840 is a wasteful number, since it uses less digits than its factorization.

618840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 618840 is about 786.6638418028. The cubic root of 618840 is about 85.2169773746.

The spelling of 618840 in words is "six hundred eighteen thousand, eight hundred forty".