398166225 has 48 divisors (see below), whose sum is σ = 696812544. Its totient is φ = 200200000.

The previous prime is 398166217. The next prime is 398166227. The reversal of 398166225 is 522661893.

It is not a de Polignac number, because 398166225 - 2³ = 398166217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398166227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120850 + ... + 124100.

It is an arithmetic number, because the mean of its divisors is an integer number (14516928).

Almost surely, 2^398166225 is an apocalyptic number.

It is an amenable number.

398166225 is a deficient number, since it is larger than the sum of its proper divisors (298646319).

398166225 is a wasteful number, since it uses less digits than its factorization.

398166225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358 (or 3353 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 398166225 is about 19954.1029615465. The cubic root of 398166225 is about 735.6786272435.

The spelling of 398166225 in words is "three hundred ninety-eight million, one hundred sixty-six thousand, two hundred twenty-five".