1604986 has 24 divisors (see below), whose sum is σ = 2647764. Its totient is φ = 728640.

The previous prime is 1604983. The next prime is 1605001. The reversal of 1604986 is 6894061.

1604986 = 190² + 191² + ... + 226².

It can be written as a sum of positive squares in 2 ways, for example, as 1600225 + 4761 = 1265^2 + 69^2 .

It is not an unprimeable number, because it can be changed into a prime (1604983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39126 + ... + 39166.

2^1604986 is an apocalyptic number.

1604986 is a deficient number, since it is larger than the sum of its proper divisors (1042778).

1604986 is a wasteful number, since it uses less digits than its factorization.

1604986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1604986 is about 1266.8804205607. The cubic root of 1604986 is about 117.0820764828.

The spelling of 1604986 in words is "one million, six hundred four thousand, nine hundred eighty-six".