3829039721 has 4 divisors (see below), whose sum is σ = 4123581252. Its totient is φ = 3534498192.

The previous prime is 3829039673. The next prime is 3829039759. The reversal of 3829039721 is 1279309283.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1771147225 + 2057892496 = 42085^2 + 45364^2 .

It is a cyclic number.

It is not a de Polignac number, because 3829039721 - 2²² = 3824845417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3829039021) 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, 147270746 + ... + 147270771.

It is an arithmetic number, because the mean of its divisors is an integer number (1030895313).

Almost surely, 2^3829039721 is an apocalyptic number.

It is an amenable number.

3829039721 is a deficient number, since it is larger than the sum of its proper divisors (294541531).

3829039721 is a wasteful number, since it uses less digits than its factorization.

3829039721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294541530.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 3829039721 is about 61879.2349742626. The cubic root of 3829039721 is about 1564.4557741854.

The spelling of 3829039721 in words is "three billion, eight hundred twenty-nine million, thirty-nine thousand, seven hundred twenty-one".