3878922961 has 9 divisors (see below), whose sum is σ = 3947420529. Its totient is φ = 3811597200.

The previous prime is 3878922947. The next prime is 3878922967. The reversal of 3878922961 is 1692298783.

The square root of 3878922961 is 62281.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 962922961 + 2916000000 = 31031^2 + 54000^2 .

It is not a de Polignac number, because 3878922961 - 2⁹ = 3878922449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3878922967) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3798631 + ... + 3799651.

It is an arithmetic number, because the mean of its divisors is an integer number (438602281).

Almost surely, 2^3878922961 is an apocalyptic number.

3878922961 is the 62281-st square number.

3878922961 is the 31141-st centered octagonal number.

It is an amenable number.

3878922961 is a deficient number, since it is larger than the sum of its proper divisors (68497568).

3878922961 is an frugal number, since it uses more digits than its factorization.

3878922961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164 (or 1082 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 55.

The cubic root of 3878922961 is about 1571.2201910319.

The spelling of 3878922961 in words is "three billion, eight hundred seventy-eight million, nine hundred twenty-two thousand, nine hundred sixty-one".