7887139 has 8 divisors (see below), whose sum is σ = 8611232. Its totient is φ = 7179840.

The previous prime is 7887097. The next prime is 7887149. The reversal of 7887139 is 9317887.

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 7887139 - 2¹¹ = 7885091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7887095 and 7887104.

It is not an unprimeable number, because it can be changed into a prime (7887149) 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 7 ways as a sum of consecutive naturals, for example, 3207 + ... + 5104.

It is an arithmetic number, because the mean of its divisors is an integer number (1076404).

Almost surely, 2^7887139 is an apocalyptic number.

7887139 is a deficient number, since it is larger than the sum of its proper divisors (724093).

7887139 is a wasteful number, since it uses less digits than its factorization.

7887139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8397.

The product of its digits is 84672, while the sum is 43.

The square root of 7887139 is about 2808.4050633767. The cubic root of 7887139 is about 199.0550338938.

The spelling of 7887139 in words is "seven million, eight hundred eighty-seven thousand, one hundred thirty-nine".