1605988 has 12 divisors (see below), whose sum is σ = 2827440. Its totient is φ = 798152.

The previous prime is 1605979. The next prime is 1606009. The reversal of 1605988 is 8895061.

It is a super-2 number, since 2×1605988² = 5158394912288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406 + ... + 1837.

It is an arithmetic number, because the mean of its divisors is an integer number (235620).

2^1605988 is an apocalyptic number.

It is an amenable number.

1605988 is a deficient number, since it is larger than the sum of its proper divisors (1221452).

1605988 is a wasteful number, since it uses less digits than its factorization.

1605988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426 (or 2424 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 1605988 is about 1267.2758184389. The cubic root of 1605988 is about 117.1064363703.

The spelling of 1605988 in words is "one million, six hundred five thousand, nine hundred eighty-eight".