6999966 has 16 divisors (see below), whose sum is σ = 15555600. Its totient is φ = 2333304.

The previous prime is 6999929. The next prime is 6999973. The reversal of 6999966 is 6699996.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 129629 = 6999966 / (6 + 9 + 9 + 9 + 9 + 6 + 6).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64761 + ... + 64868.

It is an arithmetic number, because the mean of its divisors is an integer number (972225).

Almost surely, 2^6999966 is an apocalyptic number.

6999966 is an abundant number, since it is smaller than the sum of its proper divisors (8555634).

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

6999966 is a wasteful number, since it uses less digits than its factorization.

6999966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129640 (or 129634 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The square root of 6999966 is about 2645.7448856607. The cubic root of 6999966 is about 191.2928085641.

The spelling of 6999966 in words is "six million, nine hundred ninety-nine thousand, nine hundred sixty-six".