6999440 has 80 divisors (see below), whose sum is σ = 19284480. Its totient is φ = 2311680.

The previous prime is 6999431. The next prime is 6999449. The reversal of 6999440 is 449996.

It is an interprime number because it is at equal distance from previous prime (6999431) and next prime (6999449).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (6999449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16025 + ... + 16455.

It is an arithmetic number, because the mean of its divisors is an integer number (241056).

Almost surely, 2^6999440 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 6999440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9642240).

6999440 is an abundant number, since it is smaller than the sum of its proper divisors (12285040).

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

6999440 is a wasteful number, since it uses less digits than its factorization.

6999440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 6999440 is about 2645.6454788955. The cubic root of 6999440 is about 191.2880169914.

The spelling of 6999440 in words is "six million, nine hundred ninety-nine thousand, four hundred forty".