3991384036 has 12 divisors (see below), whose sum is σ = 7352549680. Its totient is φ = 1890655560.

The previous prime is 3991384031. The next prime is 3991384039. The reversal of 3991384036 is 6304831993.

It is a super-2 number, since 2×3991384036² = 31862293045671298592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3991384031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26259030 + ... + 26259181.

Almost surely, 2^3991384036 is an apocalyptic number.

It is an amenable number.

3991384036 is a deficient number, since it is larger than the sum of its proper divisors (3361165644).

3991384036 is a wasteful number, since it uses less digits than its factorization.

3991384036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52518234 (or 52518232 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 3991384036 is about 63177.4013077461. The cubic root of 3991384036 is about 1586.2604834579.

The spelling of 3991384036 in words is "three billion, nine hundred ninety-one million, three hundred eighty-four thousand, thirty-six".