7889881 has 2 divisors, whose sum is σ = 7889882. Its totient is φ = 7889880.

The previous prime is 7889873. The next prime is 7889891. The reversal of 7889881 is 1889887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5216656 + 2673225 = 2284^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 7889881 - 2³ = 7889873 is a prime.

It is a super-2 number, since 2×7889881² = 124500444388322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7889821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3944940 + 3944941.

It is an arithmetic number, because the mean of its divisors is an integer number (3944941).

Almost surely, 2^7889881 is an apocalyptic number.

7889881 is the 1777-th centered pentagonal number.

It is an amenable number.

7889881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7889881 is an equidigital number, since it uses as much as digits as its factorization.

7889881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 49.

The square root of 7889881 is about 2808.8931983968. The cubic root of 7889881 is about 199.0780986859.

The spelling of 7889881 in words is "seven million, eight hundred eighty-nine thousand, eight hundred eighty-one".