1604405000 has 160 divisors (see below), whose sum is σ = 4237643520. Its totient is φ = 564000000.

The previous prime is 1604404999. The next prime is 1604405009. The reversal of 1604405000 is 5044061.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1604405009) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1704530 + ... + 1705470.

It is an arithmetic number, because the mean of its divisors is an integer number (26485272).

Almost surely, 2^1604405000 is an apocalyptic number.

1604405000 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 1604405000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2118821760).

1604405000 is an abundant number, since it is smaller than the sum of its proper divisors (2633238520).

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

1604405000 is a wasteful number, since it uses less digits than its factorization.

1604405000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1604405000 is about 40055.0246535937. The cubic root of 1604405000 is about 1170.6794699373.

Adding to 1604405000 its reverse (5044061), we get a palindrome (1609449061).

It can be divided in two parts, 1604 and 405000, that added together give a palindrome (406604).

The spelling of 1604405000 in words is "one billion, six hundred four million, four hundred five thousand".