1998897436 has 12 divisors (see below), whose sum is σ = 3583389600. Its totient is φ = 975071840.

The previous prime is 1998897419. The next prime is 1998897437. The reversal of 1998897436 is 6347988991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998897437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6094036 + ... + 6094363.

It is an arithmetic number, because the mean of its divisors is an integer number (298615800).

Almost surely, 2^1998897436 is an apocalyptic number.

It is an amenable number.

1998897436 is a deficient number, since it is larger than the sum of its proper divisors (1584492164).

1998897436 is a wasteful number, since it uses less digits than its factorization.

1998897436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12188444 (or 12188442 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 64.

The square root of 1998897436 is about 44709.0308103408. The cubic root of 1998897436 is about 1259.6894834048.

The spelling of 1998897436 in words is "one billion, nine hundred ninety-eight million, eight hundred ninety-seven thousand, four hundred thirty-six".