399806789806 has 8 divisors (see below), whose sum is σ = 602850029184. Its totient is φ = 198856780080.

The previous prime is 399806789791. The next prime is 399806789819. The reversal of 399806789806 is 608987608993.

It is a happy number.

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

It is a congruent 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, 523306935 + ... + 523307698.

It is an arithmetic number, because the mean of its divisors is an integer number (75356253648).

Almost surely, 2^399806789806 is an apocalyptic number.

399806789806 is a deficient number, since it is larger than the sum of its proper divisors (203043239378).

399806789806 is a wasteful number, since it uses less digits than its factorization.

399806789806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046614826.

The product of its (nonzero) digits is 282175488, while the sum is 73.

The spelling of 399806789806 in words is "three hundred ninety-nine billion, eight hundred six million, seven hundred eighty-nine thousand, eight hundred six".