1904401 has 8 divisors (see below), whose sum is σ = 1993320. Its totient is φ = 1817088.

The previous prime is 1904311. The next prime is 1904407. The reversal of 1904401 is 1044091.

It is a Cunningham number, because it is equal to 1380²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 853776 + 1050625 = 924^2 + 1025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1904401 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1904407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2475 + ... + 3151.

It is an arithmetic number, because the mean of its divisors is an integer number (249165).

2^1904401 is an apocalyptic number.

It is an amenable number.

1904401 is a deficient number, since it is larger than the sum of its proper divisors (88919).

1904401 is an equidigital number, since it uses as much as digits as its factorization.

1904401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1904401 is about 1380.0003623188. Note that the first 3 decimals coincide. The cubic root of 1904401 is about 123.9517892708.

Adding to 1904401 its reverse (1044091), we get a palindrome (2948492).

The spelling of 1904401 in words is "one million, nine hundred four thousand, four hundred one".