1901995 has 8 divisors (see below), whose sum is σ = 2402640. Its totient is φ = 1441440.

The previous prime is 1901993. The next prime is 1902007. The reversal of 1901995 is 5991091.

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

It is not a de Polignac number, because 1901995 - 2¹ = 1901993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1901995.

It is not an unprimeable number, because it can be changed into a prime (1901993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9916 + ... + 10105.

It is an arithmetic number, because the mean of its divisors is an integer number (300330).

2^1901995 is an apocalyptic number.

1901995 is a deficient number, since it is larger than the sum of its proper divisors (500645).

1901995 is a wasteful number, since it uses less digits than its factorization.

1901995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20045.

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

The square root of 1901995 is about 1379.1283479067. The cubic root of 1901995 is about 123.8995674810.

The spelling of 1901995 in words is "one million, nine hundred one thousand, nine hundred ninety-five".