2139685 has 16 divisors (see below), whose sum is σ = 2741760. Its totient is φ = 1598400.

The previous prime is 2139677. The next prime is 2139691. The reversal of 2139685 is 5869312.

It is not a de Polignac number, because 2139685 - 2³ = 2139677 is a prime.

It is an Ulam number.

2139685 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2139685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9484 + ... + 9706.

It is an arithmetic number, because the mean of its divisors is an integer number (171360).

2^2139685 is an apocalyptic number.

It is an amenable number.

2139685 is a deficient number, since it is larger than the sum of its proper divisors (602075).

2139685 is a wasteful number, since it uses less digits than its factorization.

2139685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348.

The product of its digits is 12960, while the sum is 34.

The square root of 2139685 is about 1462.7662150870. The cubic root of 2139685 is about 128.8595510856.

The spelling of 2139685 in words is "two million, one hundred thirty-nine thousand, six hundred eighty-five".