1605397984 has 24 divisors (see below), whose sum is σ = 3220265160. Its totient is φ = 787552896.

The previous prime is 1605397949. The next prime is 1605398017. The reversal of 1605397984 is 4897935061.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471594 + ... + 474985.

It is an arithmetic number, because the mean of its divisors is an integer number (134177715).

Almost surely, 2^1605397984 is an apocalyptic number.

It is an amenable number.

1605397984 is an abundant number, since it is smaller than the sum of its proper divisors (1614867176).

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

1605397984 is an equidigital number, since it uses as much as digits as its factorization.

1605397984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946642 (or 946634 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 1605397984 is about 40067.4179851909. The cubic root of 1605397984 is about 1170.9209356197.

The spelling of 1605397984 in words is "one billion, six hundred five million, three hundred ninety-seven thousand, nine hundred eighty-four".