1801849 has 4 divisors (see below), whose sum is σ = 2059264. Its totient is φ = 1544436.

The previous prime is 1801823. The next prime is 1801853. The reversal of 1801849 is 9481081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1801849 - 2⁵ = 1801817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1801849.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128697 + ... + 128710.

It is an arithmetic number, because the mean of its divisors is an integer number (514816).

2^1801849 is an apocalyptic number.

It is an amenable number.

1801849 is a deficient number, since it is larger than the sum of its proper divisors (257415).

1801849 is an equidigital number, since it uses as much as digits as its factorization.

1801849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257414.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1801849 is about 1342.3296912458. The cubic root of 1801849 is about 121.6856774780.

The spelling of 1801849 in words is "one million, eight hundred one thousand, eight hundred forty-nine".