7991340 has 96 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 1787136.

The previous prime is 7991339. The next prime is 7991341. The reversal of 7991340 is 431997.

It is an interprime number because it is at equal distance from previous prime (7991339) and next prime (7991341).

It is not an unprimeable number, because it can be changed into a prime (7991341) 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, 22081 + ... + 22439.

It is an arithmetic number, because the mean of its divisors is an integer number (272160).

Almost surely, 2^7991340 is an apocalyptic number.

7991340 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7991340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13063680).

7991340 is an abundant number, since it is smaller than the sum of its proper divisors (18136020).

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

7991340 is a wasteful number, since it uses less digits than its factorization.

7991340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 7991340 is about 2826.8958240445. The cubic root of 7991340 is about 199.9278072775.

It can be divided in two parts, 79 and 91340, that added together give a palindrome (91419).

The spelling of 7991340 in words is "seven million, nine hundred ninety-one thousand, three hundred forty".