1801005 has 8 divisors (see below), whose sum is σ = 2881632. Its totient is φ = 960528.

The previous prime is 1801003. The next prime is 1801013. The reversal of 1801005 is 5001081.

It is a happy number.

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

It is not a de Polignac number, because 1801005 - 2¹ = 1801003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 120067 = 1801005 / (1 + 8 + 0 + 1 + 0 + 0 + 5).

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801003) 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, 60019 + ... + 60048.

It is an arithmetic number, because the mean of its divisors is an integer number (360204).

2^1801005 is an apocalyptic number.

1801005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1801005 is a deficient number, since it is larger than the sum of its proper divisors (1080627).

1801005 is a wasteful number, since it uses less digits than its factorization.

1801005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120075.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1801005 is about 1342.0152756210. The cubic root of 1801005 is about 121.6666750068. Note that the first 4 decimals are identical.

Adding to 1801005 its reverse (5001081), we get a palindrome (6802086).

The spelling of 1801005 in words is "one million, eight hundred one thousand, five".