1904605 has 8 divisors (see below), whose sum is σ = 2294712. Its totient is φ = 1517568.

The previous prime is 1904597. The next prime is 1904621. The reversal of 1904605 is 5064091.

It can be written as a sum of positive squares in 4 ways, for example, as 24964 + 1879641 = 158^2 + 1371^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1904605 - 2³ = 1904597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1904605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 957 + ... + 2173.

It is an arithmetic number, because the mean of its divisors is an integer number (286839).

2^1904605 is an apocalyptic number.

It is an amenable number.

1904605 is a deficient number, since it is larger than the sum of its proper divisors (390107).

1904605 is a wasteful number, since it uses less digits than its factorization.

1904605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1904605 is about 1380.0742733636. The cubic root of 1904605 is about 123.9562150302.

Adding to 1904605 its reverse (5064091), we get a palindrome (6968696).

The spelling of 1904605 in words is "one million, nine hundred four thousand, six hundred five".