1904091 has 12 divisors (see below), whose sum is σ = 2953512. Its totient is φ = 1087968.

The previous prime is 1904087. The next prime is 1904093.

1904091 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1904091 - 2² = 1904087 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1904093) 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 11 ways as a sum of consecutive naturals, for example, 6330 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (246126).

2^1904091 is an apocalyptic number.

1904091 is a deficient number, since it is larger than the sum of its proper divisors (1049421).

1904091 is a wasteful number, since it uses less digits than its factorization.

1904091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12970 (or 12963 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 1904091 is about 1379.8880389365. Note that the first 3 decimals coincide. The cubic root of 1904091 is about 123.9450632469.

The spelling of 1904091 in words is "one million, nine hundred four thousand, ninety-one".