398922770642 has 30 divisors (see below), whose sum is σ = 658396863495. Its totient is φ = 181279404900.

The previous prime is 398922770641. The next prime is 398922770657. The reversal of 398922770642 is 246077229893.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 199461385321 + 199461385321 = 446611^2 + 446611^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=446611.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398922770641) by changing a digit.

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 14 ways as a sum of consecutive naturals, for example, 108078017 + ... + 108081707.

Almost surely, 2^398922770642 is an apocalyptic number.

398922770642 is a deficient number, since it is larger than the sum of its proper divisors (259474092853).

398922770642 is an frugal number, since it uses more digits than its factorization.

398922770642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7428 (or 3704 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 59.

The spelling of 398922770642 in words is "three hundred ninety-eight billion, nine hundred twenty-two million, seven hundred seventy thousand, six hundred forty-two".