1811995 has 8 divisors (see below), whose sum is σ = 2227680. Its totient is φ = 1414080.

The previous prime is 1811993. The next prime is 1812037. The reversal of 1811995 is 5991181.

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

It is not a de Polignac number, because 1811995 - 2¹ = 1811993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1811995.

It is not an unprimeable number, because it can be changed into a prime (1811993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4215 + ... + 4624.

It is an arithmetic number, because the mean of its divisors is an integer number (278460).

2^1811995 is an apocalyptic number.

1811995 is a deficient number, since it is larger than the sum of its proper divisors (415685).

1811995 is an equidigital number, since it uses as much as digits as its factorization.

1811995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8885.

The product of its digits is 3240, while the sum is 34.

The square root of 1811995 is about 1346.1036364263. The cubic root of 1811995 is about 121.9136493682.

The spelling of 1811995 in words is "one million, eight hundred eleven thousand, nine hundred ninety-five".