1816904 has 8 divisors (see below), whose sum is σ = 3406710. Its totient is φ = 908448.

The previous prime is 1816901. The next prime is 1816933. The reversal of 1816904 is 4096181.

It can be written as a sum of positive squares in only one way, i.e., 1444804 + 372100 = 1202^2 + 610^2 .

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

It is a super-2 number, since 2×1816904² = 6602280290432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1816901) 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, 113549 + ... + 113564.

2^1816904 is an apocalyptic number.

It is an amenable number.

1816904 is a deficient number, since it is larger than the sum of its proper divisors (1589806).

1816904 is a wasteful number, since it uses less digits than its factorization.

1816904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227119 (or 227115 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1816904 is about 1347.9258139824. The cubic root of 1816904 is about 122.0236449736.

The spelling of 1816904 in words is "one million, eight hundred sixteen thousand, nine hundred four".