2117385 has 24 divisors (see below), whose sum is σ = 3704064. Its totient is φ = 1118880.

The previous prime is 2117369. The next prime is 2117389. The reversal of 2117385 is 5837112.

It is not a de Polignac number, because 2117385 - 2⁴ = 2117369 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2117389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9384 + ... + 9606.

It is an arithmetic number, because the mean of its divisors is an integer number (154336).

2^2117385 is an apocalyptic number.

It is an amenable number.

2117385 is a deficient number, since it is larger than the sum of its proper divisors (1586679).

2117385 is a wasteful number, since it uses less digits than its factorization.

2117385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 442 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2117385 is about 1455.1237060814. The cubic root of 2117385 is about 128.4103246713.

It can be divided in two parts, 21 and 17385, that multiplied together give a triangular number (365085 = T₈₅₄).

The spelling of 2117385 in words is "two million, one hundred seventeen thousand, three hundred eighty-five".