391923850389 has 16 divisors (see below), whose sum is σ = 537837812928. Its totient is φ = 253676472192.

The previous prime is 391923850289. The next prime is 391923850447. The reversal of 391923850389 is 983058329193.

It is not a de Polignac number, because 391923850389 - 2¹¹ = 391923848341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391923850189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3728512 + ... + 3832185.

It is an arithmetic number, because the mean of its divisors is an integer number (33614863308).

Almost surely, 2^391923850389 is an apocalyptic number.

It is an amenable number.

391923850389 is a deficient number, since it is larger than the sum of its proper divisors (145913962539).

391923850389 is a wasteful number, since it uses less digits than its factorization.

391923850389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7561204.

The product of its (nonzero) digits is 12597120, while the sum is 60.

The spelling of 391923850389 in words is "three hundred ninety-one billion, nine hundred twenty-three million, eight hundred fifty thousand, three hundred eighty-nine".