3969426385 has 4 divisors (see below), whose sum is σ = 4763311668. Its totient is φ = 3175541104.

The previous prime is 3969426379. The next prime is 3969426389. The reversal of 3969426385 is 5836249693.

3969426385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5836249693 = 2063 ⋅2829011.

It can be written as a sum of positive squares in 2 ways, for example, as 2574852049 + 1394574336 = 50743^2 + 37344^2 .

It is a cyclic number.

It is not a de Polignac number, because 3969426385 - 2¹⁷ = 3969295313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3969426389) 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, 396942634 + ... + 396942643.

It is an arithmetic number, because the mean of its divisors is an integer number (1190827917).

Almost surely, 2^3969426385 is an apocalyptic number.

It is an amenable number.

3969426385 is a deficient number, since it is larger than the sum of its proper divisors (793885283).

3969426385 is an equidigital number, since it uses as much as digits as its factorization.

3969426385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793885282.

The product of its digits is 8398080, while the sum is 55.

The square root of 3969426385 is about 63003.3839170564. The cubic root of 3969426385 is about 1583.3463213216.

The spelling of 3969426385 in words is "three billion, nine hundred sixty-nine million, four hundred twenty-six thousand, three hundred eighty-five".