6398389261 has 4 divisors (see below), whose sum is σ = 6980061024. Its totient is φ = 5816717500.

The previous prime is 6398389199. The next prime is 6398389273. The reversal of 6398389261 is 1629838936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6398389261 - 2⁹ = 6398388749 is a prime.

It is a super-2 number, since 2×6398389261² = 81878770270560252242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398383261) 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, 290835865 + ... + 290835886.

It is an arithmetic number, because the mean of its divisors is an integer number (1745015256).

Almost surely, 2^6398389261 is an apocalyptic number.

It is an amenable number.

6398389261 is a deficient number, since it is larger than the sum of its proper divisors (581671763).

6398389261 is a wasteful number, since it uses less digits than its factorization.

6398389261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581671762.

The product of its digits is 3359232, while the sum is 55.

The square root of 6398389261 is about 79989.9322477523. The cubic root of 6398389261 is about 1856.4797622897.

The spelling of 6398389261 in words is "six billion, three hundred ninety-eight million, three hundred eighty-nine thousand, two hundred sixty-one".