1990201 has 4 divisors (see below), whose sum is σ = 2018304. Its totient is φ = 1962100.

The previous prime is 1990189. The next prime is 1990211. The reversal of 1990201 is 1020991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990201 is a prime.

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 a Duffinian number.

1990201 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1990211) 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, 13945 + ... + 14086.

It is an arithmetic number, because the mean of its divisors is an integer number (504576).

2^1990201 is an apocalyptic number.

It is an amenable number.

1990201 is a deficient number, since it is larger than the sum of its proper divisors (28103).

1990201 is an equidigital number, since it uses as much as digits as its factorization.

1990201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28102.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 1990201 is about 1410.7448387288. The cubic root of 1990201 is about 125.7860019153.

The spelling of 1990201 in words is "one million, nine hundred ninety thousand, two hundred one".