1604189 has 4 divisors (see below), whose sum is σ = 1688640. Its totient is φ = 1519740.

The previous prime is 1604179. The next prime is 1604191. The reversal of 1604189 is 9814061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604129) 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, 42197 + ... + 42234.

It is an arithmetic number, because the mean of its divisors is an integer number (422160).

2^1604189 is an apocalyptic number.

1604189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1604189 is a deficient number, since it is larger than the sum of its proper divisors (84451).

1604189 is an equidigital number, since it uses as much as digits as its factorization.

1604189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84450.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1604189 is about 1266.5658293196. The cubic root of 1604189 is about 117.0626931641.

The spelling of 1604189 in words is "one million, six hundred four thousand, one hundred eighty-nine".