1604997 has 6 divisors (see below), whose sum is σ = 2318342. Its totient is φ = 1069992.

The previous prime is 1604983. The next prime is 1605001. The reversal of 1604997 is 7994061.

1604997 is a `hidden beast` number, since 160 + 499 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1252161 + 352836 = 1119^2 + 594^2 .

It is not a de Polignac number, because 1604997 - 2¹¹ = 1602949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 89158 + ... + 89175.

2^1604997 is an apocalyptic number.

It is an amenable number.

1604997 is a deficient number, since it is larger than the sum of its proper divisors (713345).

1604997 is a wasteful number, since it uses less digits than its factorization.

1604997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178339 (or 178336 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1604997 is about 1266.8847619259. The cubic root of 1604997 is about 117.0823439617.

It can be divided in two parts, 1604 and 997, that added together give a square (2601 = 51²).

The spelling of 1604997 in words is "one million, six hundred four thousand, nine hundred ninety-seven".