394408409219 has 4 divisors (see below), whose sum is σ = 430263719160. Its totient is φ = 358553099280.

The previous prime is 394408409183. The next prime is 394408409249. The reversal of 394408409219 is 912904804493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 394408409219 - 2⁸ = 394408408963 is a prime.

It is a super-2 number, since 2×394408409219² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394408409249) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 17927654954 + ... + 17927654975.

It is an arithmetic number, because the mean of its divisors is an integer number (107565929790).

Almost surely, 2^394408409219 is an apocalyptic number.

394408409219 is a deficient number, since it is larger than the sum of its proper divisors (35855309941).

394408409219 is a wasteful number, since it uses less digits than its factorization.

394408409219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35855309940.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 394408409219 in words is "three hundred ninety-four billion, four hundred eight million, four hundred nine thousand, two hundred nineteen".