398216233 has 4 divisors (see below), whose sum is σ = 398353860. Its totient is φ = 398078608.

The previous prime is 398216201. The next prime is 398216251. The reversal of 398216233 is 332612893.

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

It can be written as a sum of positive squares in 2 ways, for example, as 246113344 + 152102889 = 15688^2 + 12333^2 .

It is a cyclic number.

It is not a de Polignac number, because 398216233 - 2⁵ = 398216201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 398216192 and 398216201.

It is not an unprimeable number, because it can be changed into a prime (398216263) 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, 64378 + ... + 70291.

It is an arithmetic number, because the mean of its divisors is an integer number (99588465).

Almost surely, 2^398216233 is an apocalyptic number.

It is an amenable number.

398216233 is a deficient number, since it is larger than the sum of its proper divisors (137627).

398216233 is a wasteful number, since it uses less digits than its factorization.

398216233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137626.

The product of its digits is 46656, while the sum is 37.

The square root of 398216233 is about 19955.3559978267. The cubic root of 398216233 is about 735.7094253327.

The spelling of 398216233 in words is "three hundred ninety-eight million, two hundred sixteen thousand, two hundred thirty-three".