1604000 has 48 divisors (see below), whose sum is σ = 3950856. Its totient is φ = 640000.

The previous prime is 1603963. The next prime is 1604003. The reversal of 1604000 is 4061.

It can be written as a sum of positive squares in 4 ways, for example, as 1008016 + 595984 = 1004^2 + 772^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604003) 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, 3800 + ... + 4200.

2^1604000 is an apocalyptic number.

1604000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1604000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1975428).

1604000 is an abundant number, since it is smaller than the sum of its proper divisors (2346856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1604000 is an equidigital number, since it uses as much as digits as its factorization.

1604000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1604000 is about 1266.4912159190. The cubic root of 1604000 is about 117.0580956764.

Adding to 1604000 its reverse (4061), we get a palindrome (1608061).

It can be divided in two parts, 160 and 4000, that multiplied together give a square (640000 = 800²).

The spelling of 1604000 in words is "one million, six hundred four thousand".