398981916722 has 4 divisors (see below), whose sum is σ = 598472875086. Its totient is φ = 199490958360.

The previous prime is 398981916709. The next prime is 398981916733. The reversal of 398981916722 is 227619189893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 398957720161 + 24196561 = 631631^2 + 4919^2 .

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 as a sum of consecutive naturals, namely, 99745479179 + ... + 99745479182.

Almost surely, 2^398981916722 is an apocalyptic number.

398981916722 is a deficient number, since it is larger than the sum of its proper divisors (199490958364).

398981916722 is a wasteful number, since it uses less digits than its factorization.

398981916722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199490958363.

The product of its digits is 23514624, while the sum is 65.

The spelling of 398981916722 in words is "three hundred ninety-eight billion, nine hundred eighty-one million, nine hundred sixteen thousand, seven hundred twenty-two".