1605123928 has 32 divisors (see below), whose sum is σ = 3037703760. Its totient is φ = 795104640.

The previous prime is 1605123913. The next prime is 1605123943. The reversal of 1605123928 is 8293215061.

It is an interprime number because it is at equal distance from previous prime (1605123913) and next prime (1605123943).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407826 + ... + 411742.

Almost surely, 2^1605123928 is an apocalyptic number.

It is an amenable number.

1605123928 is a deficient number, since it is larger than the sum of its proper divisors (1432579832).

1605123928 is a wasteful number, since it uses less digits than its factorization.

1605123928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4387 (or 4383 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 1605123928 is about 40063.9979033546. The cubic root of 1605123928 is about 1170.8543028858.

Adding to 1605123928 its reverse (8293215061), we get a palindrome (9898338989).

The spelling of 1605123928 in words is "one billion, six hundred five million, one hundred twenty-three thousand, nine hundred twenty-eight".