384009391881 has 12 divisors (see below), whose sum is σ = 569671590852. Its totient is φ = 249087172896.

The previous prime is 384009391867. The next prime is 384009391897. The reversal of 384009391881 is 188193900483.

It can be written as a sum of positive squares in 2 ways, for example, as 319637583225 + 64371808656 = 565365^2 + 253716^2 .

It is not a de Polignac number, because 384009391881 - 2⁹ = 384009391369 is a prime.

It is a super-2 number, since 2×384009391881² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (384009391861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 576590346 + ... + 576591011.

It is an arithmetic number, because the mean of its divisors is an integer number (47472632571).

Almost surely, 2^384009391881 is an apocalyptic number.

It is an amenable number.

384009391881 is a deficient number, since it is larger than the sum of its proper divisors (185662198971).

384009391881 is a wasteful number, since it uses less digits than its factorization.

384009391881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153181400 (or 1153181397 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 384009391881 in words is "three hundred eighty-four billion, nine million, three hundred ninety-one thousand, eight hundred eighty-one".