398992299892 has 6 divisors (see below), whose sum is σ = 698236524818. Its totient is φ = 199496149944.

The previous prime is 398992299859. The next prime is 398992299919. The reversal of 398992299892 is 298992299893.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 322708069476 + 76284230416 = 568074^2 + 276196^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49874037483 + ... + 49874037490.

Almost surely, 2^398992299892 is an apocalyptic number.

It is an amenable number.

398992299892 is a deficient number, since it is larger than the sum of its proper divisors (299244224926).

398992299892 is a wasteful number, since it uses less digits than its factorization.

398992299892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99748074977 (or 99748074975 counting only the distinct ones).

The product of its digits is 816293376, while the sum is 79.

Subtracting from 398992299892 its reverse (298992299893), we obtain a palindrome (99999999999).

The spelling of 398992299892 in words is "three hundred ninety-eight billion, nine hundred ninety-two million, two hundred ninety-nine thousand, eight hundred ninety-two".