6404392191 has 4 divisors (see below), whose sum is σ = 8539189592. Its totient is φ = 4269594792.

The previous prime is 6404392171. The next prime is 6404392213. The reversal of 6404392191 is 1912934046.

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

It is not a de Polignac number, because 6404392191 - 2⁷ = 6404392063 is a prime.

It is a super-2 number, since 2×6404392191² = 82032478672283560962, 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 (6404392151) 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 3 ways as a sum of consecutive naturals, for example, 1067398696 + ... + 1067398701.

It is an arithmetic number, because the mean of its divisors is an integer number (2134797398).

Almost surely, 2^6404392191 is an apocalyptic number.

6404392191 is a deficient number, since it is larger than the sum of its proper divisors (2134797401).

6404392191 is a wasteful number, since it uses less digits than its factorization.

6404392191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134797400.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 6404392191 is about 80027.4464855652. The cubic root of 6404392191 is about 1857.0601601703.

The spelling of 6404392191 in words is "six billion, four hundred four million, three hundred ninety-two thousand, one hundred ninety-one".