3936640251 has 4 divisors (see below), whose sum is σ = 5248853672.
Its totient is φ = 2624426832.
The previous prime is 3936640247. The next prime is 3936640313. The reversal of 3936640251 is 1520466393.
It is a semiprime because it is the product of two primes.
It is not a de Polignac number, because 3936640251 - 22 = 3936640247 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (3936640651) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656106706 + ... + 656106711.
It is an arithmetic number, because the mean of its divisors is an integer number (1312213418).
Almost surely, 23936640251 is an apocalyptic number.
3936640251 is a deficient number, since it is larger than the sum of its proper divisors (1312213421).
3936640251 is a wasteful number, since it uses less digits than its factorization.
3936640251 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1312213420.
The product of its (nonzero) digits is 116640, while the sum is 39.
The square root of 3936640251 is about 62742.6509720461.
The cubic root of 3936640251 is about 1578.9749601730.
The spelling of 3936640251 in words is "three billion, nine hundred thirty-six million, six hundred forty thousand, two hundred fifty-one".