6991842 has 64 divisors (see below), whose sum is σ = 17055360. Its totient is φ = 1881600.

The previous prime is 6991841. The next prime is 6991847. The reversal of 6991842 is 2481996.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 6991842.

It is not an unprimeable number, because it can be changed into a prime (6991841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24742 + ... + 25022.

It is an arithmetic number, because the mean of its divisors is an integer number (266490).

Almost surely, 2^6991842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6991842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8527680).

6991842 is an abundant number, since it is smaller than the sum of its proper divisors (10063518).

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

6991842 is a wasteful number, since it uses less digits than its factorization.

6991842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its digits is 31104, while the sum is 39.

The square root of 6991842 is about 2644.2091445270. The cubic root of 6991842 is about 191.2187765679.

The spelling of 6991842 in words is "six million, nine hundred ninety-one thousand, eight hundred forty-two".