3967021636 has 24 divisors (see below), whose sum is σ = 7000014560. Its totient is φ = 1967049792.

The previous prime is 3967021613. The next prime is 3967021649. The reversal of 3967021636 is 6361207693.

It is a junction number, because it is equal to n+sod(n) for n = 3967021592 and 3967021601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570895 + ... + 577801.

Almost surely, 2^3967021636 is an apocalyptic number.

It is an amenable number.

3967021636 is a deficient number, since it is larger than the sum of its proper divisors (3032992924).

3967021636 is a wasteful number, since it uses less digits than its factorization.

3967021636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8083 (or 8081 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 3967021636 is about 62984.2967413307. The cubic root of 3967021636 is about 1583.0265169581.

The spelling of 3967021636 in words is "three billion, nine hundred sixty-seven million, twenty-one thousand, six hundred thirty-six".