6398998937 has 4 divisors (see below), whose sum is σ = 6519734820. Its totient is φ = 6278263056.

The previous prime is 6398998919. The next prime is 6398998939. The reversal of 6398998937 is 7398998936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4987043161 + 1411955776 = 70619^2 + 37576^2 .

It is a cyclic number.

It is not a de Polignac number, because 6398998937 - 2¹⁴ = 6398982553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6398998939) 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, 60367862 + ... + 60367967.

It is an arithmetic number, because the mean of its divisors is an integer number (1629933705).

Almost surely, 2^6398998937 is an apocalyptic number.

It is an amenable number.

6398998937 is a deficient number, since it is larger than the sum of its proper divisors (120735883).

6398998937 is a wasteful number, since it uses less digits than its factorization.

6398998937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120735882.

The product of its digits is 158723712, while the sum is 71.

The square root of 6398998937 is about 79993.7431115709. The cubic root of 6398998937 is about 1856.5387258383.

Subtracting 6398998937 from its reverse (7398998936), we obtain a palindrome (999999999).

The spelling of 6398998937 in words is "six billion, three hundred ninety-eight million, nine hundred ninety-eight thousand, nine hundred thirty-seven".