1801904 has 20 divisors (see below), whose sum is σ = 3760176. Its totient is φ = 831552.

The previous prime is 1801901. The next prime is 1801907. The reversal of 1801904 is 4091081.

1801904 = T₅₂₀ + T₅₂₁ + ... + T₅₃₂.

It is an interprime number because it is at equal distance from previous prime (1801901) and next prime (1801907).

It is a self number, because there is not a number n which added to its sum of digits gives 1801904.

It is not an unprimeable number, because it can be changed into a prime (1801901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4124 + ... + 4539.

2^1801904 is an apocalyptic number.

It is an amenable number.

1801904 is an abundant number, since it is smaller than the sum of its proper divisors (1958272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1801904 is a wasteful number, since it uses less digits than its factorization.

1801904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8684 (or 8678 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1801904 is about 1342.3501778597. The cubic root of 1801904 is about 121.6869155848.

Adding to 1801904 its reverse (4091081), we get a palindrome (5892985).

The spelling of 1801904 in words is "one million, eight hundred one thousand, nine hundred four".