3945728002 has 4 divisors (see below), whose sum is σ = 5918592006. Its totient is φ = 1972864000.

The previous prime is 3945727997. The next prime is 3945728009. The reversal of 3945728002 is 2008275493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2008275493 = 7 ⋅286896499.

It can be written as a sum of positive squares in only one way, i.e., 3911376681 + 34351321 = 62541^2 + 5861^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (3945728009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986431999 + ... + 986432002.

Almost surely, 2^3945728002 is an apocalyptic number.

3945728002 is a deficient number, since it is larger than the sum of its proper divisors (1972864004).

3945728002 is a wasteful number, since it uses less digits than its factorization.

3945728002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972864003.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 3945728002 is about 62815.0300644679. The cubic root of 3945728002 is about 1580.1890499100.

The spelling of 3945728002 in words is "three billion, nine hundred forty-five million, seven hundred twenty-eight thousand, two".