1897998993 has 16 divisors (see below), whose sum is σ = 3067473600. Its totient is φ = 1150302240.

The previous prime is 1897998961. The next prime is 1897998997. The reversal of 1897998993 is 3998997981.

It is not a de Polignac number, because 1897998993 - 2⁵ = 1897998961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1897998997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3194988 + ... + 3195581.

It is an arithmetic number, because the mean of its divisors is an integer number (191717100).

Almost surely, 2^1897998993 is an apocalyptic number.

It is an amenable number.

1897998993 is a deficient number, since it is larger than the sum of its proper divisors (1169474607).

1897998993 is a wasteful number, since it uses less digits than its factorization.

1897998993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6390589 (or 6390583 counting only the distinct ones).

The product of its digits is 79361856, while the sum is 72.

The square root of 1897998993 is about 43566.0302644159. The cubic root of 1897998993 is about 1238.1273748156.

The spelling of 1897998993 in words is "one billion, eight hundred ninety-seven million, nine hundred ninety-eight thousand, nine hundred ninety-three".