3934417721 has 8 divisors (see below), whose sum is σ = 4253949504. Its totient is φ = 3617298000.

The previous prime is 3934417717. The next prime is 3934417757. The reversal of 3934417721 is 1277144393.

3934417721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3934417721 - 2² = 3934417717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3934417121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599621 + ... + 606146.

It is an arithmetic number, because the mean of its divisors is an integer number (531743688).

Almost surely, 2^3934417721 is an apocalyptic number.

It is an amenable number.

3934417721 is a deficient number, since it is larger than the sum of its proper divisors (319531783).

3934417721 is a wasteful number, since it uses less digits than its factorization.

3934417721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206031.

The product of its digits is 127008, while the sum is 41.

The square root of 3934417721 is about 62724.9369947870. The cubic root of 3934417721 is about 1578.6777541270.

The spelling of 3934417721 in words is "three billion, nine hundred thirty-four million, four hundred seventeen thousand, seven hundred twenty-one".