1663597 has 8 divisors (see below), whose sum is σ = 1817144. Its totient is φ = 1513728.

The previous prime is 1663589. The next prime is 1663609. The reversal of 1663597 is 7953661.

It can be written as a sum of positive squares in 4 ways, for example, as 9801 + 1653796 = 99^2 + 1286^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1663597 - 2³ = 1663589 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 (1663517) 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 7 ways as a sum of consecutive naturals, for example, 73 + ... + 1825.

It is an arithmetic number, because the mean of its divisors is an integer number (227143).

2^1663597 is an apocalyptic number.

It is an amenable number.

1663597 is a deficient number, since it is larger than the sum of its proper divisors (153547).

1663597 is a wasteful number, since it uses less digits than its factorization.

1663597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839.

The product of its digits is 34020, while the sum is 37.

The square root of 1663597 is about 1289.8050240249. The cubic root of 1663597 is about 118.4902755703.

Subtracting 1663597 from its reverse (7953661), we obtain a square (6290064 = 2508²).

The spelling of 1663597 in words is "one million, six hundred sixty-three thousand, five hundred ninety-seven".