6991794 has 48 divisors (see below), whose sum is σ = 16311672. Its totient is φ = 2156544.

The previous prime is 6991783. The next prime is 6991799. The reversal of 6991794 is 4971996.

It can be written as a sum of positive squares in 4 ways, for example, as 4995225 + 1996569 = 2235^2 + 1413^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991799) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22182 + ... + 22494.

Almost surely, 2^6991794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6991794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8155836).

6991794 is an abundant number, since it is smaller than the sum of its proper divisors (9319878).

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

6991794 is a wasteful number, since it uses less digits than its factorization.

6991794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 408 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 6991794 is about 2644.2000680735. The cubic root of 6991794 is about 191.2183389855.

The spelling of 6991794 in words is "six million, nine hundred ninety-one thousand, seven hundred ninety-four".