398990050656 has 48 divisors (see below), whose sum is σ = 1049779035648. Its totient is φ = 132688092800.

The previous prime is 398990050651. The next prime is 398990050673. The reversal of 398990050656 is 656050099893.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 398990050656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398990050651) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4780140 + ... + 4862891.

It is an arithmetic number, because the mean of its divisors is an integer number (21870396576).

Almost surely, 2^398990050656 is an apocalyptic number.

It is an amenable number.

398990050656 is an abundant number, since it is smaller than the sum of its proper divisors (650788984992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398990050656 is a wasteful number, since it uses less digits than its factorization.

398990050656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9643475 (or 9643467 counting only the distinct ones).

The product of its (nonzero) digits is 15746400, while the sum is 60.

The spelling of 398990050656 in words is "three hundred ninety-eight billion, nine hundred ninety million, fifty thousand, six hundred fifty-six".