6403943908 has 24 divisors (see below), whose sum is σ = 11681873280. Its totient is φ = 3067952160.

The previous prime is 6403943869. The next prime is 6403943929. The reversal of 6403943908 is 8093493046.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195516 + ... + 225907.

It is an arithmetic number, because the mean of its divisors is an integer number (486744720).

Almost surely, 2^6403943908 is an apocalyptic number.

It is an amenable number.

6403943908 is a deficient number, since it is larger than the sum of its proper divisors (5277929372).

6403943908 is a wasteful number, since it uses less digits than its factorization.

6403943908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421587 (or 421585 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 6403943908 is about 80024.6456287062. The cubic root of 6403943908 is about 1857.0168301191.

The spelling of 6403943908 in words is "six billion, four hundred three million, nine hundred forty-three thousand, nine hundred eight".