398882185891 has 4 divisors (see below), whose sum is σ = 455865355312. Its totient is φ = 341899016472.

The previous prime is 398882185853. The next prime is 398882185963. The reversal of 398882185891 is 198581288893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398882185891 - 2¹³ = 398882177699 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 398882185891.

It is not an unprimeable number, because it can be changed into a prime (398882185831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28491584700 + ... + 28491584713.

It is an arithmetic number, because the mean of its divisors is an integer number (113966338828).

Almost surely, 2^398882185891 is an apocalyptic number.

398882185891 is a deficient number, since it is larger than the sum of its proper divisors (56983169421).

398882185891 is an equidigital number, since it uses as much as digits as its factorization.

398882185891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56983169420.

The product of its digits is 79626240, while the sum is 70.

The spelling of 398882185891 in words is "three hundred ninety-eight billion, eight hundred eighty-two million, one hundred eighty-five thousand, eight hundred ninety-one".