398879354221 has 8 divisors (see below), whose sum is σ = 402194019960. Its totient is φ = 395570531328.

The previous prime is 398879354197. The next prime is 398879354243. The reversal of 398879354221 is 122453978893.

It can be written as a sum of positive squares in 4 ways, for example, as 281946132196 + 116933222025 = 530986^2 + 341955^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 398879354221 - 2⁹ = 398879353709 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 398879354221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398879354261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1323556 + ... + 1596733.

It is an arithmetic number, because the mean of its divisors is an integer number (50274252495).

Almost surely, 2^398879354221 is an apocalyptic number.

It is an amenable number.

398879354221 is a deficient number, since it is larger than the sum of its proper divisors (3314665739).

398879354221 is a wasteful number, since it uses less digits than its factorization.

398879354221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921423.

The product of its digits is 26127360, while the sum is 61.

The spelling of 398879354221 in words is "three hundred ninety-eight billion, eight hundred seventy-nine million, three hundred fifty-four thousand, two hundred twenty-one".