7138889 has 8 divisors (see below), whose sum is σ = 7619040. Its totient is φ = 6669216.

The previous prime is 7138883. The next prime is 7138919. The reversal of 7138889 is 9888317.

7138889 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7138889 - 2¹² = 7134793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7138883) 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 7 ways as a sum of consecutive naturals, for example, 1187 + ... + 3960.

It is an arithmetic number, because the mean of its divisors is an integer number (952380).

Almost surely, 2^7138889 is an apocalyptic number.

It is an amenable number.

7138889 is a deficient number, since it is larger than the sum of its proper divisors (480151).

7138889 is a wasteful number, since it uses less digits than its factorization.

7138889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5239.

The product of its digits is 96768, while the sum is 44.

The square root of 7138889 is about 2671.8699444397. The cubic root of 7138889 is about 192.5500089333.

The spelling of 7138889 in words is "seven million, one hundred thirty-eight thousand, eight hundred eighty-nine".