394970139816 has 96 divisors (see below), whose sum is σ = 1135061309760. Its totient is φ = 112194878976.

The previous prime is 394970139757. The next prime is 394970139841. The reversal of 394970139816 is 618931079493.

It is a super-2 number, since 2×394970139816² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 394970139816.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4988796 + ... + 5067348.

It is an arithmetic number, because the mean of its divisors is an integer number (11823555310).

Almost surely, 2^394970139816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394970139816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (567530654880).

394970139816 is an abundant number, since it is smaller than the sum of its proper divisors (740091169944).

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

394970139816 is a wasteful number, since it uses less digits than its factorization.

394970139816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78915 (or 78738 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 60.

The spelling of 394970139816 in words is "three hundred ninety-four billion, nine hundred seventy million, one hundred thirty-nine thousand, eight hundred sixteen".