7991394 has 16 divisors (see below), whose sum is σ = 16923168. Its totient is φ = 2507072.

The previous prime is 7991369. The next prime is 7991407. The reversal of 7991394 is 4931997.

7991394 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

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, 39072 + ... + 39275.

It is an arithmetic number, because the mean of its divisors is an integer number (1057698).

Almost surely, 2^7991394 is an apocalyptic number.

7991394 is an abundant number, since it is smaller than the sum of its proper divisors (8931774).

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

7991394 is a wasteful number, since it uses less digits than its factorization.

7991394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78369.

The product of its digits is 61236, while the sum is 42.

The square root of 7991394 is about 2826.9053751408. The cubic root of 7991394 is about 199.9282576016.

It can be divided in two parts, 7991 and 394, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 7991394 in words is "seven million, nine hundred ninety-one thousand, three hundred ninety-four".