3960721439 has 4 divisors (see below), whose sum is σ = 4016506320. Its totient is φ = 3904936560.

The previous prime is 3960721423. The next prime is 3960721451. The reversal of 3960721439 is 9341270693.

3960721439 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.

It is a cyclic number.

It is not a de Polignac number, because 3960721439 - 2⁴ = 3960721423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3960721439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3960721469) 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, 27892334 + ... + 27892475.

It is an arithmetic number, because the mean of its divisors is an integer number (1004126580).

Almost surely, 2^3960721439 is an apocalyptic number.

3960721439 is a deficient number, since it is larger than the sum of its proper divisors (55784881).

3960721439 is an equidigital number, since it uses as much as digits as its factorization.

3960721439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55784880.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 3960721439 is about 62934.2628382982. The cubic root of 3960721439 is about 1582.1880488571.

The spelling of 3960721439 in words is "three billion, nine hundred sixty million, seven hundred twenty-one thousand, four hundred thirty-nine".