1605241405 has 16 divisors (see below), whose sum is σ = 2040645744. Its totient is φ = 1208033280.

The previous prime is 1605241387. The next prime is 1605241423. The reversal of 1605241405 is 5041425061.

It is an interprime number because it is at equal distance from previous prime (1605241387) and next prime (1605241423).

It can be written as a sum of positive squares in 8 ways, for example, as 456505956 + 1148735449 = 21366^2 + 33893^2 .

It is not a de Polignac number, because 1605241405 - 2¹³ = 1605233213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227125 + ... + 234085.

It is an arithmetic number, because the mean of its divisors is an integer number (127540359).

Almost surely, 2^1605241405 is an apocalyptic number.

It is an amenable number.

1605241405 is a deficient number, since it is larger than the sum of its proper divisors (435404339).

1605241405 is a wasteful number, since it uses less digits than its factorization.

1605241405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9696.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1605241405 is about 40065.4639933197. The cubic root of 1605241405 is about 1170.8828666399.

Adding to 1605241405 its reverse (5041425061), we get a palindrome (6646666466).

The spelling of 1605241405 in words is "one billion, six hundred five million, two hundred forty-one thousand, four hundred five".