394171615982 has 8 divisors (see below), whose sum is σ = 626037272496. Its totient is φ = 185492525152.

The previous prime is 394171615961. The next prime is 394171615991. The reversal of 394171615982 is 289516171493.

It is a happy number.

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

It is a super-2 number, since 2×394171615982² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5796641378 + ... + 5796641445.

It is an arithmetic number, because the mean of its divisors is an integer number (78254659062).

Almost surely, 2^394171615982 is an apocalyptic number.

394171615982 is a deficient number, since it is larger than the sum of its proper divisors (231865656514).

394171615982 is a wasteful number, since it uses less digits than its factorization.

394171615982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11593282842.

The product of its digits is 3265920, while the sum is 56.

The spelling of 394171615982 in words is "three hundred ninety-four billion, one hundred seventy-one million, six hundred fifteen thousand, nine hundred eighty-two".