6398779231 has 6 divisors (see below), whose sum is σ = 6928855800. Its totient is φ = 5906565288.

The previous prime is 6398779229. The next prime is 6398779279. The reversal of 6398779231 is 1329778936.

It is a happy number.

It is not a de Polignac number, because 6398779231 - 2¹ = 6398779229 is a prime.

It is a super-2 number, since 2×6398779231² = 81888751294153902722, 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 (6398779201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18931131 + ... + 18931468.

It is an arithmetic number, because the mean of its divisors is an integer number (1154809300).

Almost surely, 2^6398779231 is an apocalyptic number.

6398779231 is a deficient number, since it is larger than the sum of its proper divisors (530076569).

6398779231 is a wasteful number, since it uses less digits than its factorization.

6398779231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37862625 (or 37862612 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 55.

The square root of 6398779231 is about 79992.3698298781. The cubic root of 6398779231 is about 1856.5174778603.

The spelling of 6398779231 in words is "six billion, three hundred ninety-eight million, seven hundred seventy-nine thousand, two hundred thirty-one".