7890881 has 2 divisors, whose sum is σ = 7890882. Its totient is φ = 7890880.

The previous prime is 7890859. The next prime is 7890913. The reversal of 7890881 is 1880987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7890481 + 400 = 2809^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 7890881 - 2¹⁴ = 7874497 is a prime.

It is a super-2 number, since 2×7890881² = 124532005912322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7890811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3945440 + 3945441.

It is an arithmetic number, because the mean of its divisors is an integer number (3945441).

Almost surely, 2^7890881 is an apocalyptic number.

It is an amenable number.

7890881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7890881 is an equidigital number, since it uses as much as digits as its factorization.

7890881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 7890881 is about 2809.0711988129. The cubic root of 7890881 is about 199.0865090235.

The spelling of 7890881 in words is "seven million, eight hundred ninety thousand, eight hundred eighty-one".