7881139 has 8 divisors (see below), whose sum is σ = 9155168. Its totient is φ = 6644160.

The previous prime is 7881113. The next prime is 7881151. The reversal of 7881139 is 9311887.

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 7881139 - 2⁹ = 7880627 is a prime.

It is a super-2 number, since 2×7881139² = 124224703874642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7881098 and 7881107.

It is not an unprimeable number, because it can be changed into a prime (7881179) 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, 8802 + ... + 9655.

It is an arithmetic number, because the mean of its divisors is an integer number (1144396).

Almost surely, 2^7881139 is an apocalyptic number.

7881139 is a deficient number, since it is larger than the sum of its proper divisors (1274029).

7881139 is a wasteful number, since it uses less digits than its factorization.

7881139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18525.

The product of its digits is 12096, while the sum is 37.

The square root of 7881139 is about 2807.3366381679. The cubic root of 7881139 is about 199.0045452359.

The spelling of 7881139 in words is "seven million, eight hundred eighty-one thousand, one hundred thirty-nine".