1811864 has 8 divisors (see below), whose sum is σ = 3397260. Its totient is φ = 905928.

The previous prime is 1811851. The next prime is 1811867. The reversal of 1811864 is 4681181.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1811867) 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 as a sum of consecutive naturals, namely, 113234 + ... + 113249.

2^1811864 is an apocalyptic number.

It is an amenable number.

1811864 is a deficient number, since it is larger than the sum of its proper divisors (1585396).

1811864 is a wasteful number, since it uses less digits than its factorization.

1811864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226489 (or 226485 counting only the distinct ones).

The product of its digits is 1536, while the sum is 29.

The square root of 1811864 is about 1346.0549765890. The cubic root of 1811864 is about 121.9107113408.

The spelling of 1811864 in words is "one million, eight hundred eleven thousand, eight hundred sixty-four".