399188881993 has 8 divisors (see below), whose sum is σ = 440371801440. Its totient is φ = 358821466080.

The previous prime is 399188881951. The next prime is 399188881999.

399188881993 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399188881993 - 2²⁵ = 399155327561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399188881999) 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 7 ways as a sum of consecutive naturals, for example, 203874855 + ... + 203876812.

It is an arithmetic number, because the mean of its divisors is an integer number (55046475180).

Almost surely, 2^399188881993 is an apocalyptic number.

It is an amenable number.

399188881993 is a deficient number, since it is larger than the sum of its proper divisors (41182919447).

399188881993 is a wasteful number, since it uses less digits than its factorization.

399188881993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407751767.

The product of its digits is 241864704, while the sum is 76.

The spelling of 399188881993 in words is "three hundred ninety-nine billion, one hundred eighty-eight million, eight hundred eighty-one thousand, nine hundred ninety-three".