1897959798 has 48 divisors (see below), whose sum is σ = 4976169120. Its totient is φ = 510375168.

The previous prime is 1897959797. The next prime is 1897959857. The reversal of 1897959798 is 8979597981.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897959797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 440893 + ... + 445176.

It is an arithmetic number, because the mean of its divisors is an integer number (103670190).

Almost surely, 2^1897959798 is an apocalyptic number.

1897959798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1897959798 is an abundant number, since it is smaller than the sum of its proper divisors (3078209322).

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

1897959798 is a wasteful number, since it uses less digits than its factorization.

1897959798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886101 (or 886098 counting only the distinct ones).

The product of its digits is 102876480, while the sum is 72.

The square root of 1897959798 is about 43565.5804276725. The cubic root of 1897959798 is about 1238.1188520263.

The spelling of 1897959798 in words is "one billion, eight hundred ninety-seven million, nine hundred fifty-nine thousand, seven hundred ninety-eight".