1800901 has 4 divisors (see below), whose sum is σ = 1849612. Its totient is φ = 1752192.

The previous prime is 1800889. The next prime is 1800907. The reversal of 1800901 is 1090081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1090081 = 29 ⋅37589.

It can be written as a sum of positive squares in 2 ways, for example, as 748225 + 1052676 = 865^2 + 1026^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800901 - 2⁹ = 1800389 is a prime.

It is a Duffinian number.

1800901 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800907) by changing a digit.

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, 24300 + ... + 24373.

It is an arithmetic number, because the mean of its divisors is an integer number (462403).

2^1800901 is an apocalyptic number.

It is an amenable number.

1800901 is a deficient number, since it is larger than the sum of its proper divisors (48711).

1800901 is an equidigital number, since it uses as much as digits as its factorization.

1800901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48710.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 1800901 is about 1341.9765273655. The cubic root of 1800901 is about 121.6643330592.

Adding to 1800901 its reverse (1090081), we get a palindrome (2890982).

It can be divided in two parts, 1800 and 901, that added together give a triangular number (2701 = T₇₃).

The spelling of 1800901 in words is "one million, eight hundred thousand, nine hundred one".