394459609991 has 8 divisors (see below), whose sum is σ = 399221754624. Its totient is φ = 389723995960.

The previous prime is 394459609979. The next prime is 394459610009. The reversal of 394459609991 is 199906954493.

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

It is a cyclic number.

It is not a de Polignac number, because 394459609991 - 2⁶ = 394459609927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394459609591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6602735 + ... + 6662208.

It is an arithmetic number, because the mean of its divisors is an integer number (49902719328).

Almost surely, 2^394459609991 is an apocalyptic number.

394459609991 is a deficient number, since it is larger than the sum of its proper divisors (4762144633).

394459609991 is a wasteful number, since it uses less digits than its factorization.

394459609991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13265301.

The product of its (nonzero) digits is 85030560, while the sum is 68.

The spelling of 394459609991 in words is "three hundred ninety-four billion, four hundred fifty-nine million, six hundred nine thousand, nine hundred ninety-one".