1801249 has 4 divisors (see below), whose sum is σ = 1806336. Its totient is φ = 1796164.

The previous prime is 1801237. The next prime is 1801259. The reversal of 1801249 is 9421081.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-1801249 is a prime.

It is a Duffinian number.

1801249 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1801229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969 + ... + 2734.

It is an arithmetic number, because the mean of its divisors is an integer number (451584).

2^1801249 is an apocalyptic number.

It is an amenable number.

1801249 is a deficient number, since it is larger than the sum of its proper divisors (5087).

1801249 is an equidigital number, since it uses as much as digits as its factorization.

1801249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5086.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1801249 is about 1342.1061805982. The cubic root of 1801249 is about 121.6721692222.

The spelling of 1801249 in words is "one million, eight hundred one thousand, two hundred forty-nine".