6408638394 has 8 divisors (see below), whose sum is σ = 12817276800. Its totient is φ = 2136212796.

The previous prime is 6408638381. The next prime is 6408638437. The reversal of 6408638394 is 4938368046.

It is a happy number.

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

6408638394 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534053194 + ... + 534053205.

It is an arithmetic number, because the mean of its divisors is an integer number (1602159600).

Almost surely, 2^6408638394 is an apocalyptic number.

6408638394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6408638394 is a wasteful number, since it uses less digits than its factorization.

6408638394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068106404.

The product of its (nonzero) digits is 2985984, while the sum is 51.

The square root of 6408638394 is about 80053.9717565593. The cubic root of 6408638394 is about 1857.4704885880.

The spelling of 6408638394 in words is "six billion, four hundred eight million, six hundred thirty-eight thousand, three hundred ninety-four".