1605223004 has 48 divisors (see below), whose sum is σ = 3513705216. Its totient is φ = 623376000.

The previous prime is 1605223003. The next prime is 1605223049. The reversal of 1605223004 is 4003225061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605223003) 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, 88079 + ... + 104729.

It is an arithmetic number, because the mean of its divisors is an integer number (73202192).

Almost surely, 2^1605223004 is an apocalyptic number.

1605223004 is a gapful number since it is divisible by the number (14) 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 1605223004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1756852608).

1605223004 is an abundant number, since it is smaller than the sum of its proper divisors (1908482212).

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

1605223004 is a wasteful number, since it uses less digits than its factorization.

1605223004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16986 (or 16984 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1605223004 is about 40065.2343559850. The cubic root of 1605223004 is about 1170.8783926507.

Adding to 1605223004 its reverse (4003225061), we get a palindrome (5608448065).

The spelling of 1605223004 in words is "one billion, six hundred five million, two hundred twenty-three thousand, four".