7890889 has 4 divisors (see below), whose sum is σ = 7919056. Its totient is φ = 7862724.

The previous prime is 7890881. The next prime is 7890913. The reversal of 7890889 is 9880987.

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 an emirpimes, since its reverse is a distinct semiprime: 9880987 = 151 ⋅65437.

It is a cyclic number.

It is not a de Polignac number, because 7890889 - 2³ = 7890881 is a prime.

It is a super-2 number, since 2×7890889² = 124532258420642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7890881) 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 in 3 ways as a sum of consecutive naturals, for example, 13659 + ... + 14224.

It is an arithmetic number, because the mean of its divisors is an integer number (1979764).

Almost surely, 2^7890889 is an apocalyptic number.

It is an amenable number.

7890889 is a deficient number, since it is larger than the sum of its proper divisors (28167).

7890889 is a wasteful number, since it uses less digits than its factorization.

7890889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28166.

The product of its (nonzero) digits is 290304, while the sum is 49.

The square root of 7890889 is about 2809.0726227707. The cubic root of 7890889 is about 199.0865763033.

The spelling of 7890889 in words is "seven million, eight hundred ninety thousand, eight hundred eighty-nine".