7920889 has 4 divisors (see below), whose sum is σ = 7995024. Its totient is φ = 7846756.

The previous prime is 7920883. The next prime is 7920893. The reversal of 7920889 is 9880297.

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: 9880297 = 7 ⋅1411471.

It is a cyclic number.

It is not a de Polignac number, because 7920889 - 2⁷ = 7920761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7920883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36907 + ... + 37120.

It is an arithmetic number, because the mean of its divisors is an integer number (1998756).

Almost surely, 2^7920889 is an apocalyptic number.

It is an amenable number.

7920889 is a deficient number, since it is larger than the sum of its proper divisors (74135).

7920889 is a wasteful number, since it uses less digits than its factorization.

7920889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74134.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 7920889 is about 2814.4073976594. The cubic root of 7920889 is about 199.3385565410.

It can be divided in two parts, 79208 and 89, that added together give a palindrome (79297).

The spelling of 7920889 in words is "seven million, nine hundred twenty thousand, eight hundred eighty-nine".