399781384446 has 8 divisors (see below), whose sum is σ = 799562768904. Its totient is φ = 133260461480.

The previous prime is 399781384439. The next prime is 399781384489. The reversal of 399781384446 is 644483187993.

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

399781384446 is an admirable number.

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, 33315115365 + ... + 33315115376.

It is an arithmetic number, because the mean of its divisors is an integer number (99945346113).

Almost surely, 2^399781384446 is an apocalyptic number.

399781384446 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.

399781384446 is a wasteful number, since it uses less digits than its factorization.

399781384446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66630230746.

The product of its digits is 125411328, while the sum is 66.

The spelling of 399781384446 in words is "three hundred ninety-nine billion, seven hundred eighty-one million, three hundred eighty-four thousand, four hundred forty-six".