398642225 has 6 divisors (see below), whose sum is σ = 494316390. Its totient is φ = 318913760.

The previous prime is 398642171. The next prime is 398642227. The reversal of 398642225 is 522246893.

It can be written as a sum of positive squares in 3 ways, for example, as 200704 + 398441521 = 448^2 + 19961^2 .

It is not a de Polignac number, because 398642225 - 2¹⁴ = 398625841 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (398642227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7972820 + ... + 7972869.

It is an arithmetic number, because the mean of its divisors is an integer number (82386065).

Almost surely, 2^398642225 is an apocalyptic number.

It is an amenable number.

398642225 is a deficient number, since it is larger than the sum of its proper divisors (95674165).

398642225 is a wasteful number, since it uses less digits than its factorization.

398642225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15945699 (or 15945694 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 398642225 is about 19966.0267704919. The cubic root of 398642225 is about 735.9716736745.

The spelling of 398642225 in words is "three hundred ninety-eight million, six hundred forty-two thousand, two hundred twenty-five".