398888819 has 4 divisors (see below), whose sum is σ = 455872944. Its totient is φ = 341904696.

The previous prime is 398888813. The next prime is 398888851. The reversal of 398888819 is 918888893.

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

It is not a de Polignac number, because 398888819 - 2⁴ = 398888803 is a prime.

It is a super-2 number, since 2×398888819² = 318224579846429522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398888813) 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, 28492052 + ... + 28492065.

It is an arithmetic number, because the mean of its divisors is an integer number (113968236).

Almost surely, 2^398888819 is an apocalyptic number.

398888819 is a deficient number, since it is larger than the sum of its proper divisors (56984125).

398888819 is an equidigital number, since it uses as much as digits as its factorization.

398888819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56984124.

The product of its digits is 7962624, while the sum is 62.

The square root of 398888819 is about 19972.2011556063. The cubic root of 398888819 is about 736.1233960117.

The spelling of 398888819 in words is "three hundred ninety-eight million, eight hundred eighty-eight thousand, eight hundred nineteen".