2005690 has 8 divisors (see below), whose sum is σ = 3610260. Its totient is φ = 802272.

The previous prime is 2005687. The next prime is 2005693. The reversal of 2005690 is 965002.

It is an interprime number because it is at equal distance from previous prime (2005687) and next prime (2005693).

It can be written as a sum of positive squares in 2 ways, for example, as 1896129 + 109561 = 1377^2 + 331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2005690² = 8045584752200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2005693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100275 + ... + 100294.

2^2005690 is an apocalyptic number.

2005690 is a deficient number, since it is larger than the sum of its proper divisors (1604570).

2005690 is a wasteful number, since it uses less digits than its factorization.

2005690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200576.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 2005690 is about 1416.2238523623. The cubic root of 2005690 is about 126.1114743719. Note that the first 3 decimals are identical.

The spelling of 2005690 in words is "two million, five thousand, six hundred ninety".