7872889 has 4 divisors (see below), whose sum is σ = 7898356. Its totient is φ = 7847424.

The previous prime is 7872883. The next prime is 7872919. The reversal of 7872889 is 9882787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1537600 + 6335289 = 1240^2 + 2517^2 .

It is a cyclic number.

It is not a de Polignac number, because 7872889 - 2¹³ = 7864697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7872883) 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, 12264 + ... + 12889.

It is an arithmetic number, because the mean of its divisors is an integer number (1974589).

Almost surely, 2^7872889 is an apocalyptic number.

It is an amenable number.

7872889 is a deficient number, since it is larger than the sum of its proper divisors (25467).

7872889 is a wasteful number, since it uses less digits than its factorization.

7872889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25466.

The product of its digits is 451584, while the sum is 49.

The square root of 7872889 is about 2805.8668892162. The cubic root of 7872889 is about 198.9350814733.

The spelling of 7872889 in words is "seven million, eight hundred seventy-two thousand, eight hundred eighty-nine".