2117975 has 6 divisors (see below), whose sum is σ = 2626320. Its totient is φ = 1694360.

The previous prime is 2117971. The next prime is 2117977. The reversal of 2117975 is 5797112.

It is not a de Polignac number, because 2117975 - 2² = 2117971 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42335 + ... + 42384.

It is an arithmetic number, because the mean of its divisors is an integer number (437720).

2^2117975 is an apocalyptic number.

2117975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2117975 is a deficient number, since it is larger than the sum of its proper divisors (508345).

2117975 is an equidigital number, since it uses as much as digits as its factorization.

2117975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84729 (or 84724 counting only the distinct ones).

The product of its digits is 4410, while the sum is 32.

The square root of 2117975 is about 1455.3264238651. The cubic root of 2117975 is about 128.4222505540.

The spelling of 2117975 in words is "two million, one hundred seventeen thousand, nine hundred seventy-five".