3813646399 has 4 divisors (see below), whose sum is σ = 3979457136. Its totient is φ = 3647835664.

The previous prime is 3813646357. The next prime is 3813646409. The reversal of 3813646399 is 9936463183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9936463183 = 37 ⋅268553059.

It is a cyclic number.

It is not a de Polignac number, because 3813646399 - 2¹⁵ = 3813613631 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 (3813646339) 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, 82905334 + ... + 82905379.

It is an arithmetic number, because the mean of its divisors is an integer number (994864284).

Almost surely, 2^3813646399 is an apocalyptic number.

3813646399 is a deficient number, since it is larger than the sum of its proper divisors (165810737).

3813646399 is a wasteful number, since it uses less digits than its factorization.

3813646399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165810736.

The product of its digits is 2519424, while the sum is 52.

The square root of 3813646399 is about 61754.7277461410. The cubic root of 3813646399 is about 1562.3565084997.

The spelling of 3813646399 in words is "three billion, eight hundred thirteen million, six hundred forty-six thousand, three hundred ninety-nine".