2139985 has 4 divisors (see below), whose sum is σ = 2567988. Its totient is φ = 1711984.

The previous prime is 2139979. The next prime is 2140001. The reversal of 2139985 is 5899312.

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 439569 + 1700416 = 663^2 + 1304^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139985 - 2⁵ = 2139953 is a prime.

It is a super-3 number, since 3×2139985³ = 29400413758333489875, which contains 333 as substring.

It is a Duffinian number.

2139985 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213994 + ... + 214003.

It is an arithmetic number, because the mean of its divisors is an integer number (641997).

2^2139985 is an apocalyptic number.

It is an amenable number.

2139985 is a deficient number, since it is larger than the sum of its proper divisors (428003).

2139985 is an equidigital number, since it uses as much as digits as its factorization.

2139985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428002.

The product of its digits is 19440, while the sum is 37.

The square root of 2139985 is about 1462.8687569293. The cubic root of 2139985 is about 128.8655731650.

The spelling of 2139985 in words is "two million, one hundred thirty-nine thousand, nine hundred eighty-five".