3978867789 has 24 divisors (see below), whose sum is σ = 6205012632. Its totient is φ = 2442337920.

The previous prime is 3978867769. The next prime is 3978867791. The reversal of 3978867789 is 9877688793.

3978867789 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 412164 + 3978455625 = 642^2 + 63075^2 .

It is not a de Polignac number, because 3978867789 - 2¹⁶ = 3978802253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978867719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3619 + ... + 89279.

It is an arithmetic number, because the mean of its divisors is an integer number (258542193).

Almost surely, 2^3978867789 is an apocalyptic number.

3978867789 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

3978867789 is a deficient number, since it is larger than the sum of its proper divisors (2226144843).

3978867789 is a wasteful number, since it uses less digits than its factorization.

3978867789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86077 (or 86074 counting only the distinct ones).

The product of its digits is 256048128, while the sum is 72.

The square root of 3978867789 is about 63078.2671686533. The cubic root of 3978867789 is about 1584.6006734831.

The spelling of 3978867789 in words is "three billion, nine hundred seventy-eight million, eight hundred sixty-seven thousand, seven hundred eighty-nine".