3847729666 has 16 divisors (see below), whose sum is σ = 6342248160. Its totient is φ = 1736200480.

The previous prime is 3847729621. The next prime is 3847729673. The reversal of 3847729666 is 6669277483.

It is a super-3 number, since 3×3847729666³ (a number of 30 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3847729666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635296 + ... + 641323.

It is an arithmetic number, because the mean of its divisors is an integer number (396390510).

Almost surely, 2^3847729666 is an apocalyptic number.

3847729666 is a deficient number, since it is larger than the sum of its proper divisors (2494518494).

3847729666 is a wasteful number, since it uses less digits than its factorization.

3847729666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276769.

The product of its digits is 18289152, while the sum is 58.

The square root of 3847729666 is about 62030.0706593181. The cubic root of 3847729666 is about 1566.9970681956.

The spelling of 3847729666 in words is "three billion, eight hundred forty-seven million, seven hundred twenty-nine thousand, six hundred sixty-six".