398808811 has 4 divisors (see below), whose sum is σ = 400248832. Its totient is φ = 397368792.

The previous prime is 398808793. The next prime is 398808821. The reversal of 398808811 is 118808893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118808893 = 7 ⋅16972699.

It is a cyclic number.

It is not a de Polignac number, because 398808811 - 2⁹ = 398808299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398808821) 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, 719595 + ... + 720148.

It is an arithmetic number, because the mean of its divisors is an integer number (100062208).

Almost surely, 2^398808811 is an apocalyptic number.

398808811 is a deficient number, since it is larger than the sum of its proper divisors (1440021).

398808811 is a wasteful number, since it uses less digits than its factorization.

398808811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440020.

The product of its (nonzero) digits is 110592, while the sum is 46.

The square root of 398808811 is about 19970.1980711259. The cubic root of 398808811 is about 736.0741761990.

The spelling of 398808811 in words is "three hundred ninety-eight million, eight hundred eight thousand, eight hundred eleven".