1813995 has 24 divisors (see below), whose sum is σ = 3262896. Its totient is φ = 966816.

The previous prime is 1813993. The next prime is 1814003. The reversal of 1813995 is 5993181.

Added to its reverse (5993181) it gives a triangular number (7807176 = T₃₉₅₁).

It is a happy number.

It is not a de Polignac number, because 1813995 - 2¹ = 1813993 is a prime.

1813995 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1813991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 469 + ... + 1961.

It is an arithmetic number, because the mean of its divisors is an integer number (135954).

2^1813995 is an apocalyptic number.

1813995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1813995 is a deficient number, since it is larger than the sum of its proper divisors (1448901).

1813995 is an equidigital number, since it uses as much as digits as its factorization.

1813995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513 (or 1501 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1813995 is about 1346.8463163999. The cubic root of 1813995 is about 121.9584871750.

Adding to 1813995 its reverse (5993181), we get a triangular number (7807176 = T₃₉₅₁).

The spelling of 1813995 in words is "one million, eight hundred thirteen thousand, nine hundred ninety-five".