398407225 has 6 divisors (see below), whose sum is σ = 494024990. Its totient is φ = 318725760.

The previous prime is 398407213. The next prime is 398407237. The reversal of 398407225 is 522704893.

It is an interprime number because it is at equal distance from previous prime (398407213) and next prime (398407237).

It can be written as a sum of positive squares in 3 ways, for example, as 141991056 + 256416169 = 11916^2 + 16013^2 .

It is not a de Polignac number, because 398407225 - 2²¹ = 396310073 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7968120 + ... + 7968169.

Almost surely, 2^398407225 is an apocalyptic number.

It is an amenable number.

398407225 is a deficient number, since it is larger than the sum of its proper divisors (95617765).

398407225 is a wasteful number, since it uses less digits than its factorization.

398407225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15936299 (or 15936294 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 398407225 is about 19960.1409063163. The cubic root of 398407225 is about 735.8270265624.

The spelling of 398407225 in words is "three hundred ninety-eight million, four hundred seven thousand, two hundred twenty-five".