3966739421 has 16 divisors (see below), whose sum is σ = 4440692160. Its totient is φ = 3521260800.

The previous prime is 3966739411. The next prime is 3966739453. The reversal of 3966739421 is 1249376693.

It is a cyclic number.

It is not a de Polignac number, because 3966739421 - 2²² = 3962545117 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3966739421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3966739411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46271 + ... + 100371.

It is an arithmetic number, because the mean of its divisors is an integer number (277543260).

Almost surely, 2^3966739421 is an apocalyptic number.

It is an amenable number.

3966739421 is a deficient number, since it is larger than the sum of its proper divisors (473952739).

3966739421 is a wasteful number, since it uses less digits than its factorization.

3966739421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54364.

The product of its digits is 1469664, while the sum is 50.

The square root of 3966739421 is about 62982.0563414692. The cubic root of 3966739421 is about 1582.9889770886.

The spelling of 3966739421 in words is "three billion, nine hundred sixty-six million, seven hundred thirty-nine thousand, four hundred twenty-one".