2139385 has 4 divisors (see below), whose sum is σ = 2567268. Its totient is φ = 1711504.

The previous prime is 2139383. The next prime is 2139407. The reversal of 2139385 is 5839312.

It is a happy number.

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 1225449 + 913936 = 1107^2 + 956^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139385 - 2¹ = 2139383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213934 + ... + 213943.

It is an arithmetic number, because the mean of its divisors is an integer number (641817).

2^2139385 is an apocalyptic number.

It is an amenable number.

2139385 is a deficient number, since it is larger than the sum of its proper divisors (427883).

2139385 is an equidigital number, since it uses as much as digits as its factorization.

2139385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427882.

The product of its digits is 6480, while the sum is 31.

The square root of 2139385 is about 1462.6636660559. The cubic root of 2139385 is about 128.8535284433.

The spelling of 2139385 in words is "two million, one hundred thirty-nine thousand, three hundred eighty-five".