1904993 has 4 divisors (see below), whose sum is σ = 1922580. Its totient is φ = 1887408.

The previous prime is 1904977. The next prime is 1904999. The reversal of 1904993 is 3994091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3994091 = 773 ⋅5167.

It can be written as a sum of positive squares in 2 ways, for example, as 677329 + 1227664 = 823^2 + 1108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1904993 - 2⁴ = 1904977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1904999) 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, 8630 + ... + 8847.

It is an arithmetic number, because the mean of its divisors is an integer number (480645).

2^1904993 is an apocalyptic number.

It is an amenable number.

1904993 is a deficient number, since it is larger than the sum of its proper divisors (17587).

1904993 is a wasteful number, since it uses less digits than its factorization.

1904993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17586.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 1904993 is about 1380.2148383495. The cubic root of 1904993 is about 123.9646317791.

The spelling of 1904993 in words is "one million, nine hundred four thousand, nine hundred ninety-three".