3945449138 has 8 divisors (see below), whose sum is σ = 5931012780. Its totient is φ = 1968444880.

The previous prime is 3945449111. The next prime is 3945449149. The reversal of 3945449138 is 8319445493.

It can be written as a sum of positive squares in 2 ways, for example, as 3836935249 + 108513889 = 61943^2 + 10417^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2138693 + ... + 2140536.

Almost surely, 2^3945449138 is an apocalyptic number.

3945449138 is a deficient number, since it is larger than the sum of its proper divisors (1985563642).

3945449138 is a wasteful number, since it uses less digits than its factorization.

3945449138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4279692.

The product of its digits is 1866240, while the sum is 50.

The square root of 3945449138 is about 62812.8103017211. The cubic root of 3945449138 is about 1580.1518224562.

The spelling of 3945449138 in words is "three billion, nine hundred forty-five million, four hundred forty-nine thousand, one hundred thirty-eight".