1990195 has 4 divisors (see below), whose sum is σ = 2388240. Its totient is φ = 1592152.

The previous prime is 1990189. The next prime is 1990211. The reversal of 1990195 is 5910991.

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

It is a cyclic number.

It is not a de Polignac number, because 1990195 - 2³ = 1990187 is a prime.

It is a super-2 number, since 2×1990195² = 7921752276050, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1990195.

It is an unprimeable number.

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, 199015 + ... + 199024.

It is an arithmetic number, because the mean of its divisors is an integer number (597060).

2^1990195 is an apocalyptic number.

1990195 is a deficient number, since it is larger than the sum of its proper divisors (398045).

1990195 is an equidigital number, since it uses as much as digits as its factorization.

1990195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398044.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 1990195 is about 1410.7427121910. The cubic root of 1990195 is about 125.7858755098.

The spelling of 1990195 in words is "one million, nine hundred ninety thousand, one hundred ninety-five".