2117955 has 32 divisors (see below), whose sum is σ = 4045824. Its totient is φ = 925056.

The previous prime is 2117953. The next prime is 2117971. The reversal of 2117955 is 5597112.

It is not a de Polignac number, because 2117955 - 2¹ = 2117953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2117953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1977 + ... + 2853.

It is an arithmetic number, because the mean of its divisors is an integer number (126432).

2^2117955 is an apocalyptic number.

2117955 is a deficient number, since it is larger than the sum of its proper divisors (1927869).

2117955 is a wasteful number, since it uses less digits than its factorization.

2117955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915.

The product of its digits is 3150, while the sum is 30.

The square root of 2117955 is about 1455.3195525382. The cubic root of 2117955 is about 128.4218463231.

The spelling of 2117955 in words is "two million, one hundred seventeen thousand, nine hundred fifty-five".