1985538198 has 16 divisors (see below), whose sum is σ = 4538373120. Its totient is φ = 567296616.

The previous prime is 1985538197. The next prime is 1985538211. The reversal of 1985538198 is 8918355891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985538197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23637318 + ... + 23637401.

It is an arithmetic number, because the mean of its divisors is an integer number (283648320).

Almost surely, 2^1985538198 is an apocalyptic number.

1985538198 is an abundant number, since it is smaller than the sum of its proper divisors (2552834922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1985538198 is a wasteful number, since it uses less digits than its factorization.

1985538198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47274731.

The product of its digits is 3110400, while the sum is 57.

The square root of 1985538198 is about 44559.3783394697. The cubic root of 1985538198 is about 1256.8769126505.

The spelling of 1985538198 in words is "one billion, nine hundred eighty-five million, five hundred thirty-eight thousand, one hundred ninety-eight".