6991434 has 40 divisors (see below), whose sum is σ = 15855840. Its totient is φ = 2302344.

The previous prime is 6991427. The next prime is 6991447. The reversal of 6991434 is 4341996.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16477 + ... + 16895.

It is an arithmetic number, because the mean of its divisors is an integer number (396396).

Almost surely, 2^6991434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6991434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7927920).

6991434 is an abundant number, since it is smaller than the sum of its proper divisors (8864406).

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

6991434 is a wasteful number, since it uses less digits than its factorization.

6991434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536 (or 527 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 6991434 is about 2644.1319936796. The cubic root of 6991434 is about 191.2150570532.

The spelling of 6991434 in words is "six million, nine hundred ninety-one thousand, four hundred thirty-four".