3920408749 has 2 divisors, whose sum is σ = 3920408750. Its totient is φ = 3920408748.

The previous prime is 3920408747. The next prime is 3920408753. The reversal of 3920408749 is 9478040293.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2687696649 + 1232712100 = 51843^2 + 35110^2 .

It is an emirp because it is prime and its reverse (9478040293) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3920408749 - 2¹ = 3920408747 is a prime.

Together with 3920408747, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3920408699 and 3920408708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3920408747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960204374 + 1960204375.

It is an arithmetic number, because the mean of its divisors is an integer number (1960204375).

Almost surely, 2^3920408749 is an apocalyptic number.

It is an amenable number.

3920408749 is a deficient number, since it is larger than the sum of its proper divisors (1).

3920408749 is an equidigital number, since it uses as much as digits as its factorization.

3920408749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 3920408749 is about 62613.1675368688. The cubic root of 3920408749 is about 1576.8018346086.

The spelling of 3920408749 in words is "three billion, nine hundred twenty million, four hundred eight thousand, seven hundred forty-nine".