1904609 has 16 divisors (see below), whose sum is σ = 2297856. Its totient is φ = 1544400.

The previous prime is 1904597. The next prime is 1904621. The reversal of 1904609 is 9064091.

It is an interprime number because it is at equal distance from previous prime (1904597) and next prime (1904621).

It is a cyclic number.

It is not a de Polignac number, because 1904609 - 2¹⁶ = 1839073 is a prime.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1904509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14474 + ... + 14604.

It is an arithmetic number, because the mean of its divisors is an integer number (143616).

2^1904609 is an apocalyptic number.

It is an amenable number.

1904609 is a deficient number, since it is larger than the sum of its proper divisors (393247).

1904609 is a wasteful number, since it uses less digits than its factorization.

1904609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1904609 is about 1380.0757225602. The cubic root of 1904609 is about 123.9563018067.

The spelling of 1904609 in words is "one million, nine hundred four thousand, six hundred nine".