606840 has 64 divisors (see below), whose sum is σ = 1965600. Its totient is φ = 148992.

The previous prime is 606839. The next prime is 606847. The reversal of 606840 is 48606.

It is a Cunningham number, because it is equal to 779²-1.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 606840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (606847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1366 + ... + 1754.

2⁶⁰⁶⁸⁴⁰ is an apocalyptic number.

606840 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 606840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982800).

606840 is an abundant number, since it is smaller than the sum of its proper divisors (1358760).

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

606840 is a wasteful number, since it uses less digits than its factorization.

606840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 606840 is about 778.9993581512. Note that the first 3 decimals coincide. The cubic root of 606840 is about 84.6625606816.

The spelling of 606840 in words is "six hundred six thousand, eight hundred forty".