3647993 has 4 divisors (see below), whose sum is σ = 3651828. Its totient is φ = 3644160.

The previous prime is 3647989. The next prime is 3648031. The reversal of 3647993 is 3997463.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 595984 + 3052009 = 772^2 + 1747^2 .

It is a cyclic number.

It is not a de Polignac number, because 3647993 - 2² = 3647989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3647993.

It is not an unprimeable number, because it can be changed into a prime (3647953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713 + ... + 2793.

It is an arithmetic number, because the mean of its divisors is an integer number (912957).

Almost surely, 2^3647993 is an apocalyptic number.

It is an amenable number.

3647993 is a deficient number, since it is larger than the sum of its proper divisors (3835).

3647993 is a wasteful number, since it uses less digits than its factorization.

3647993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834.

The product of its digits is 122472, while the sum is 41.

The square root of 3647993 is about 1909.9719893234. The cubic root of 3647993 is about 153.9399467879.

The spelling of 3647993 in words is "three million, six hundred forty-seven thousand, nine hundred ninety-three".