3920872649 has 2 divisors, whose sum is σ = 3920872650. Its totient is φ = 3920872648.

The previous prime is 3920872609. The next prime is 3920872687. The reversal of 3920872649 is 9462780293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3717097024 + 203775625 = 60968^2 + 14275^2 .

It is a cyclic number.

It is not a de Polignac number, because 3920872649 - 2²⁸ = 3652437193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3920872597 and 3920872606.

It is not a weakly prime, because it can be changed into another prime (3920872609) 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, 1960436324 + 1960436325.

It is an arithmetic number, because the mean of its divisors is an integer number (1960436325).

Almost surely, 2^3920872649 is an apocalyptic number.

It is an amenable number.

3920872649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3920872649 is an equidigital number, since it uses as much as digits as its factorization.

3920872649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 3920872649 is about 62616.8719196352. The cubic root of 3920872649 is about 1576.8640262122.

The spelling of 3920872649 in words is "three billion, nine hundred twenty million, eight hundred seventy-two thousand, six hundred forty-nine".