398787944964 has 12 divisors (see below), whose sum is σ = 930505204944. Its totient is φ = 132929314984.

The previous prime is 398787944959. The next prime is 398787944981. The reversal of 398787944964 is 469449787893.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×398787944964² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 398787944964.

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, 16616164362 + ... + 16616164385.

It is an arithmetic number, because the mean of its divisors is an integer number (77542100412).

Almost surely, 2^398787944964 is an apocalyptic number.

It is an amenable number.

398787944964 is an abundant number, since it is smaller than the sum of its proper divisors (531717259980).

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

398787944964 is a wasteful number, since it uses less digits than its factorization.

398787944964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33232328754 (or 33232328752 counting only the distinct ones).

The product of its digits is 2633637888, while the sum is 78.

The spelling of 398787944964 in words is "three hundred ninety-eight billion, seven hundred eighty-seven million, nine hundred forty-four thousand, nine hundred sixty-four".