3936205820 has 96 divisors (see below), whose sum is σ = 8736456960. Its totient is φ = 1488015360.

The previous prime is 3936205799. The next prime is 3936205829. The reversal of 3936205820 is 285026393.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3936205829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4200392 + ... + 4201328.

It is an arithmetic number, because the mean of its divisors is an integer number (91004760).

Almost surely, 2^3936205820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3936205820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4368228480).

3936205820 is an abundant number, since it is smaller than the sum of its proper divisors (4800251140).

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

3936205820 is a wasteful number, since it uses less digits than its factorization.

3936205820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 3936205820 is about 62739.1888694777. The cubic root of 3936205820 is about 1578.9168750325.

The spelling of 3936205820 in words is "three billion, nine hundred thirty-six million, two hundred five thousand, eight hundred twenty".