3665997 has 24 divisors (see below), whose sum is σ = 5542680. Its totient is φ = 2332800.

The previous prime is 3665989. The next prime is 3666001. The reversal of 3665997 is 7995663.

It can be written as a sum of positive squares in 4 ways, for example, as 2643876 + 1022121 = 1626^2 + 1011^2 .

It is not a de Polignac number, because 3665997 - 2³ = 3665989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665297) 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 23 ways as a sum of consecutive naturals, for example, 33579 + ... + 33687.

It is an arithmetic number, because the mean of its divisors is an integer number (230945).

Almost surely, 2^3665997 is an apocalyptic number.

3665997 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

3665997 is a deficient number, since it is larger than the sum of its proper divisors (1876683).

3665997 is a wasteful number, since it uses less digits than its factorization.

3665997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 250 counting only the distinct ones).

The product of its digits is 306180, while the sum is 45.

The square root of 3665997 is about 1914.6793465225. The cubic root of 3665997 is about 154.1927787602.

It can be divided in two parts, 3 and 665997, that multiplied together give a palindrome (1997991).

The spelling of 3665997 in words is "three million, six hundred sixty-five thousand, nine hundred ninety-seven".