3649766399 has 4 divisors (see below), whose sum is σ = 3649895160. Its totient is φ = 3649637640.

The previous prime is 3649766389. The next prime is 3649766423. The reversal of 3649766399 is 9936679463.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9936679463 = 5653 ⋅1757771.

It is a cyclic number.

It is not a de Polignac number, because 3649766399 - 2⁸ = 3649766143 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 (3649766359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1184 + ... + 85445.

It is an arithmetic number, because the mean of its divisors is an integer number (912473790).

Almost surely, 2^3649766399 is an apocalyptic number.

3649766399 is a deficient number, since it is larger than the sum of its proper divisors (128761).

3649766399 is an equidigital number, since it uses as much as digits as its factorization.

3649766399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128760.

The product of its digits is 39680928, while the sum is 62.

The square root of 3649766399 is about 60413.2965414072. The cubic root of 3649766399 is about 1539.6488769123.

The spelling of 3649766399 in words is "three billion, six hundred forty-nine million, seven hundred sixty-six thousand, three hundred ninety-nine".