3947069818 has 8 divisors (see below), whose sum is σ = 5942615220. Its totient is φ = 1966198080.

The previous prime is 3947069779. The next prime is 3947069887. The reversal of 3947069818 is 8189607493.

3947069818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2587451689 + 1359618129 = 50867^2 + 36873^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3667743 + ... + 3668818.

Almost surely, 2^3947069818 is an apocalyptic number.

3947069818 is a deficient number, since it is larger than the sum of its proper divisors (1995545402).

3947069818 is a wasteful number, since it uses less digits than its factorization.

3947069818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7336832.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The square root of 3947069818 is about 62825.7098487554. The cubic root of 3947069818 is about 1580.3681535417.

The spelling of 3947069818 in words is "three billion, nine hundred forty-seven million, sixty-nine thousand, eight hundred eighteen".