397516198989 has 16 divisors (see below), whose sum is σ = 652334275712. Its totient is φ = 209678874048.

The previous prime is 397516198943. The next prime is 397516198993. The reversal of 397516198989 is 989891615793.

It is not a de Polignac number, because 397516198989 - 2²⁴ = 397499421773 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 397516198989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397516198589) 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, 728051374 + ... + 728051919.

It is an arithmetic number, because the mean of its divisors is an integer number (40770892232).

Almost surely, 2^397516198989 is an apocalyptic number.

397516198989 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

397516198989 is a deficient number, since it is larger than the sum of its proper divisors (254818076723).

397516198989 is a wasteful number, since it uses less digits than its factorization.

397516198989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456103316.

The product of its digits is 264539520, while the sum is 75.

The spelling of 397516198989 in words is "three hundred ninety-seven billion, five hundred sixteen million, one hundred ninety-eight thousand, nine hundred eighty-nine".