3943681386 has 32 divisors (see below), whose sum is σ = 8354275200. Its totient is φ = 1236796416.

The previous prime is 3943681303. The next prime is 3943681457. The reversal of 3943681386 is 6831863493.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403890 + ... + 413538.

It is an arithmetic number, because the mean of its divisors is an integer number (261071100).

Almost surely, 2^3943681386 is an apocalyptic number.

3943681386 is an abundant number, since it is smaller than the sum of its proper divisors (4410593814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3943681386 is a wasteful number, since it uses less digits than its factorization.

3943681386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13678.

The product of its digits is 2239488, while the sum is 51.

The square root of 3943681386 is about 62798.7371369839. The cubic root of 3943681386 is about 1579.9157923930.

The spelling of 3943681386 in words is "three billion, nine hundred forty-three million, six hundred eighty-one thousand, three hundred eighty-six".