2117387 has 4 divisors (see below), whose sum is σ = 2132760. Its totient is φ = 2102016.

The previous prime is 2117369. The next prime is 2117389. The reversal of 2117387 is 7837112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2117387 - 2⁸ = 2117131 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 7478 + ... + 7755.

It is an arithmetic number, because the mean of its divisors is an integer number (533190).

2^2117387 is an apocalyptic number.

2117387 is a deficient number, since it is larger than the sum of its proper divisors (15373).

2117387 is a wasteful number, since it uses less digits than its factorization.

2117387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15372.

The product of its digits is 2352, while the sum is 29.

The square root of 2117387 is about 1455.1243933080. The cubic root of 2117387 is about 128.4103651017.

The spelling of 2117387 in words is "two million, one hundred seventeen thousand, three hundred eighty-seven".