1998512456 has 16 divisors (see below), whose sum is σ = 3766832640. Its totient is φ = 994023760.

The previous prime is 1998512449. The next prime is 1998512471. The reversal of 1998512456 is 6542158991.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 652436 + ... + 655491.

It is an arithmetic number, because the mean of its divisors is an integer number (235427040).

Almost surely, 2^1998512456 is an apocalyptic number.

It is an amenable number.

1998512456 is a deficient number, since it is larger than the sum of its proper divisors (1768320184).

1998512456 is a wasteful number, since it uses less digits than its factorization.

1998512456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308124 (or 1308120 counting only the distinct ones).

The product of its digits is 777600, while the sum is 50.

The square root of 1998512456 is about 44704.7252088635. The cubic root of 1998512456 is about 1259.6086077538.

The spelling of 1998512456 in words is "one billion, nine hundred ninety-eight million, five hundred twelve thousand, four hundred fifty-six".