2001658 has 4 divisors (see below), whose sum is σ = 3002490. Its totient is φ = 1000828.

The previous prime is 2001653. The next prime is 2001673. The reversal of 2001658 is 8561002.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1570009 + 431649 = 1253^2 + 657^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2001653) 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 as a sum of consecutive naturals, namely, 500413 + ... + 500416.

2^2001658 is an apocalyptic number.

2001658 is a deficient number, since it is larger than the sum of its proper divisors (1000832).

2001658 is a wasteful number, since it uses less digits than its factorization.

2001658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000831.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 2001658 is about 1414.7996324568. The cubic root of 2001658 is about 126.0269111915.

The spelling of 2001658 in words is "two million, one thousand, six hundred fifty-eight".