398882178421 has 16 divisors (see below), whose sum is σ = 410763571200. Its totient is φ = 387202561200.

The previous prime is 398882178419. The next prime is 398882178439. The reversal of 398882178421 is 124871288893.

It is not a de Polignac number, because 398882178421 - 2¹ = 398882178419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398882178421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398882173421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1914586 + ... + 2112676.

It is an arithmetic number, because the mean of its divisors is an integer number (25672723200).

Almost surely, 2^398882178421 is an apocalyptic number.

It is an amenable number.

398882178421 is a deficient number, since it is larger than the sum of its proper divisors (11881392779).

398882178421 is a wasteful number, since it uses less digits than its factorization.

398882178421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198600.

The product of its digits is 12386304, while the sum is 61.

The spelling of 398882178421 in words is "three hundred ninety-eight billion, eight hundred eighty-two million, one hundred seventy-eight thousand, four hundred twenty-one".