1605225405 has 32 divisors (see below), whose sum is σ = 2945343744. Its totient is φ = 731298816.

The previous prime is 1605225403. The next prime is 1605225491. The reversal of 1605225405 is 5045225061.

It is not a de Polignac number, because 1605225405 - 2¹ = 1605225403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605225403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4677 + ... + 56853.

It is an arithmetic number, because the mean of its divisors is an integer number (92041992).

Almost surely, 2^1605225405 is an apocalyptic number.

1605225405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1605225405 is a deficient number, since it is larger than the sum of its proper divisors (1340118339).

1605225405 is a wasteful number, since it uses less digits than its factorization.

1605225405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52485.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1605225405 is about 40065.2643196073. The cubic root of 1605225405 is about 1170.8789764279.

The spelling of 1605225405 in words is "one billion, six hundred five million, two hundred twenty-five thousand, four hundred five".