3891979445 has 8 divisors (see below), whose sum is σ = 4671069144. Its totient is φ = 3113121024.

The previous prime is 3891979411. The next prime is 3891979447. The reversal of 3891979445 is 5449791983.

It can be written as a sum of positive squares in 4 ways, for example, as 1990408996 + 1901570449 = 44614^2 + 43607^2 .

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 3891979445 - 2¹⁸ = 3891717301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891979447) 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, 18344 + ... + 90113.

It is an arithmetic number, because the mean of its divisors is an integer number (583883643).

Almost surely, 2^3891979445 is an apocalyptic number.

It is an amenable number.

3891979445 is a deficient number, since it is larger than the sum of its proper divisors (779089699).

3891979445 is a wasteful number, since it uses less digits than its factorization.

3891979445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115639.

The product of its digits is 9797760, while the sum is 59.

The square root of 3891979445 is about 62385.7311009497. The cubic root of 3891979445 is about 1572.9811297419.

The spelling of 3891979445 in words is "three billion, eight hundred ninety-one million, nine hundred seventy-nine thousand, four hundred forty-five".