6404400826 has 8 divisors (see below), whose sum is σ = 9610129620. Its totient is φ = 3201024288.

The previous prime is 6404400823. The next prime is 6404400829. The reversal of 6404400826 is 6280044046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6404400823) and next prime (6404400829).

It can be written as a sum of positive squares in 2 ways, for example, as 5854545225 + 549855601 = 76515^2 + 23449^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6404400791 and 6404400800.

It is not an unprimeable number, because it can be changed into a prime (6404400823) 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, 581241 + ... + 592156.

Almost surely, 2^6404400826 is an apocalyptic number.

6404400826 is a deficient number, since it is larger than the sum of its proper divisors (3205728794).

6404400826 is a wasteful number, since it uses less digits than its factorization.

6404400826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176128.

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 6404400826 is about 80027.5004357877. The cubic root of 6404400826 is about 1857.0609947906.

The spelling of 6404400826 in words is "six billion, four hundred four million, four hundred thousand, eight hundred twenty-six".