398225656 has 16 divisors (see below), whose sum is σ = 751620240. Its totient is φ = 197793600.

The previous prime is 398225647. The next prime is 398225699. The reversal of 398225656 is 656522893.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163621 + ... + 166036.

It is an arithmetic number, because the mean of its divisors is an integer number (46976265).

Almost surely, 2^398225656 is an apocalyptic number.

It is an amenable number.

398225656 is a deficient number, since it is larger than the sum of its proper divisors (353394584).

398225656 is a wasteful number, since it uses less digits than its factorization.

398225656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329814 (or 329810 counting only the distinct ones).

The product of its digits is 777600, while the sum is 46.

The square root of 398225656 is about 19955.5920984570. The cubic root of 398225656 is about 735.7152283234.

The spelling of 398225656 in words is "three hundred ninety-eight million, two hundred twenty-five thousand, six hundred fifty-six".