3840781817 has 4 divisors (see below), whose sum is σ = 3857554020. Its totient is φ = 3824009616.

The previous prime is 3840781811. The next prime is 3840781829. The reversal of 3840781817 is 7181870483.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7181870483 = 10039 ⋅715397.

It can be written as a sum of positive squares in 2 ways, for example, as 2667102736 + 1173679081 = 51644^2 + 34259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3840781817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3840781811) 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, 8385758 + ... + 8386215.

It is an arithmetic number, because the mean of its divisors is an integer number (964388505).

Almost surely, 2^3840781817 is an apocalyptic number.

It is an amenable number.

3840781817 is a deficient number, since it is larger than the sum of its proper divisors (16772203).

3840781817 is a wasteful number, since it uses less digits than its factorization.

3840781817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16772202.

The product of its (nonzero) digits is 301056, while the sum is 47.

The square root of 3840781817 is about 61974.0414770572. The cubic root of 3840781817 is about 1566.0533239113.

The spelling of 3840781817 in words is "three billion, eight hundred forty million, seven hundred eighty-one thousand, eight hundred seventeen".