391788871607 has 32 divisors (see below), whose sum is σ = 471455920128. Its totient is φ = 318517920000.

The previous prime is 391788871583. The next prime is 391788871619. The reversal of 391788871607 is 706178887193.

It is not a de Polignac number, because 391788871607 - 2³⁴ = 374609002423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391788871657) 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, 3666932 + ... + 3772262.

It is an arithmetic number, because the mean of its divisors is an integer number (14732997504).

Almost surely, 2^391788871607 is an apocalyptic number.

391788871607 is a deficient number, since it is larger than the sum of its proper divisors (79667048521).

391788871607 is a wasteful number, since it uses less digits than its factorization.

391788871607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105711.

The product of its (nonzero) digits is 28449792, while the sum is 65.

The spelling of 391788871607 in words is "three hundred ninety-one billion, seven hundred eighty-eight million, eight hundred seventy-one thousand, six hundred seven".