2117690 has 16 divisors (see below), whose sum is σ = 4036392. Its totient is φ = 797184.

The previous prime is 2117677. The next prime is 2117699. The reversal of 2117690 is 967112.

It can be written as a sum of positive squares in 4 ways, for example, as 2076481 + 41209 = 1441^2 + 203^2 .

It is a super-2 number, since 2×2117690² = 8969221872200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2117699) 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 7 ways as a sum of consecutive naturals, for example, 6059 + ... + 6398.

2^2117690 is an apocalyptic number.

2117690 is a deficient number, since it is larger than the sum of its proper divisors (1918702).

2117690 is a wasteful number, since it uses less digits than its factorization.

2117690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12481.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 2117690 is about 1455.2285043937. The cubic root of 2117690 is about 128.4164900228.

The spelling of 2117690 in words is "two million, one hundred seventeen thousand, six hundred ninety".