398431618779 has 8 divisors (see below), whose sum is σ = 531316705360. Its totient is φ = 265583805696.

The previous prime is 398431618751. The next prime is 398431618829. The reversal of 398431618779 is 977816134893.

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

It is not a de Polignac number, because 398431618779 - 2⁵ = 398431618747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398431613779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9293422 + ... + 9336195.

It is an arithmetic number, because the mean of its divisors is an integer number (66414588170).

Almost surely, 2^398431618779 is an apocalyptic number.

398431618779 is a deficient number, since it is larger than the sum of its proper divisors (132885086581).

398431618779 is a wasteful number, since it uses less digits than its factorization.

398431618779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18636749.

The product of its digits is 54867456, while the sum is 66.

The spelling of 398431618779 in words is "three hundred ninety-eight billion, four hundred thirty-one million, six hundred eighteen thousand, seven hundred seventy-nine".