7919881 has 4 divisors (see below), whose sum is σ = 7925632. Its totient is φ = 7914132.

The previous prime is 7919861. The next prime is 7919893. The reversal of 7919881 is 1889197.

7919881 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1889197 = 23 ⋅82139.

It is a cyclic number.

It is not a de Polignac number, because 7919881 - 2¹³ = 7911689 is a prime.

It is a super-2 number, since 2×7919881² = 125449030108322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7919801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556 + ... + 4018.

It is an arithmetic number, because the mean of its divisors is an integer number (1981408).

Almost surely, 2^7919881 is an apocalyptic number.

It is an amenable number.

7919881 is a deficient number, since it is larger than the sum of its proper divisors (5751).

7919881 is a wasteful number, since it uses less digits than its factorization.

7919881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5750.

The product of its digits is 36288, while the sum is 43.

The square root of 7919881 is about 2814.2283134103. The cubic root of 7919881 is about 199.3301003442.

The spelling of 7919881 in words is "seven million, nine hundred nineteen thousand, eight hundred eighty-one".