3940819813 has 4 divisors (see below), whose sum is σ = 4503794080. Its totient is φ = 3377845548.

The previous prime is 3940819801. The next prime is 3940819819. The reversal of 3940819813 is 3189180493.

It is a happy number.

3940819813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3940819813 - 2²¹ = 3938722661 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 (3940819819) 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, 281487123 + ... + 281487136.

It is an arithmetic number, because the mean of its divisors is an integer number (1125948520).

Almost surely, 2^3940819813 is an apocalyptic number.

It is an amenable number.

3940819813 is a deficient number, since it is larger than the sum of its proper divisors (562974267).

3940819813 is an equidigital number, since it uses as much as digits as its factorization.

3940819813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562974266.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 3940819813 is about 62775.9493197833. The cubic root of 3940819813 is about 1579.5335659167.

The spelling of 3940819813 in words is "three billion, nine hundred forty million, eight hundred nineteen thousand, eight hundred thirteen".