2806139 has 8 divisors (see below), whose sum is σ = 3395808. Its totient is φ = 2263680.

The previous prime is 2806123. The next prime is 2806157. The reversal of 2806139 is 9316082.

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 2806139 - 2⁴ = 2806123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2806109) 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, 11672 + ... + 11909.

It is an arithmetic number, because the mean of its divisors is an integer number (424476).

2^2806139 is an apocalyptic number.

2806139 is a deficient number, since it is larger than the sum of its proper divisors (589669).

2806139 is a wasteful number, since it uses less digits than its factorization.

2806139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23605.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 2806139 is about 1675.1534258091. The cubic root of 2806139 is about 141.0489074676.

The spelling of 2806139 in words is "two million, eight hundred six thousand, one hundred thirty-nine".