1801899 has 16 divisors (see below), whose sum is σ = 2912640. Its totient is φ = 1091880.

The previous prime is 1801897. The next prime is 1801901. The reversal of 1801899 is 9981081.

It is an interprime number because it is at equal distance from previous prime (1801897) and next prime (1801901).

It is not a de Polignac number, because 1801899 - 2¹ = 1801897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1801897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2737 + ... + 3330.

It is an arithmetic number, because the mean of its divisors is an integer number (182040).

2^1801899 is an apocalyptic number.

1801899 is a deficient number, since it is larger than the sum of its proper divisors (1110741).

1801899 is a wasteful number, since it uses less digits than its factorization.

1801899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6087 (or 6081 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1801899 is about 1342.3483154532. The cubic root of 1801899 is about 121.6868030307.

The spelling of 1801899 in words is "one million, eight hundred one thousand, eight hundred ninety-nine".