6699840 has 112 divisors (see below), whose sum is σ = 24335232. Its totient is φ = 1529856.

The previous prime is 6699839. The next prime is 6699857. The reversal of 6699840 is 489966.

It is a tau number, because it is divible by the number of its divisors (112).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 6699792 and 6699801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6222 + ... + 7218.

Almost surely, 2^6699840 is an apocalyptic number.

6699840 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 6699840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12167616).

6699840 is an abundant number, since it is smaller than the sum of its proper divisors (17635392).

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

6699840 is a wasteful number, since it uses less digits than its factorization.

6699840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 6699840 is about 2588.4049142281. The cubic root of 6699840 is about 188.5188624305.

The spelling of 6699840 in words is "six million, six hundred ninety-nine thousand, eight hundred forty".