3940721836 has 24 divisors (see below), whose sum is σ = 7224144480. Its totient is φ = 1877348352.

The previous prime is 3940721821. The next prime is 3940721849. The reversal of 3940721836 is 6381270493.

3940721836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 3940721792 and 3940721801.

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, 59691 + ... + 106978.

It is an arithmetic number, because the mean of its divisors is an integer number (301006020).

Almost surely, 2^3940721836 is an apocalyptic number.

It is an amenable number.

3940721836 is a deficient number, since it is larger than the sum of its proper divisors (3283422644).

3940721836 is a wasteful number, since it uses less digits than its factorization.

3940721836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166953 (or 166951 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 3940721836 is about 62775.1689444162. The cubic root of 3940721836 is about 1579.5204756419.

The spelling of 3940721836 in words is "three billion, nine hundred forty million, seven hundred twenty-one thousand, eight hundred thirty-six".