394408493 has 8 divisors (see below), whose sum is σ = 411711000. Its totient is φ = 377455680.

The previous prime is 394408489. The next prime is 394408507. The reversal of 394408493 is 394804493.

It can be written as a sum of positive squares in 4 ways, for example, as 163277284 + 231131209 = 12778^2 + 15203^2 .

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 394408493 - 2² = 394408489 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 (394408423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85118 + ... + 89631.

It is an arithmetic number, because the mean of its divisors is an integer number (51463875).

Almost surely, 2^394408493 is an apocalyptic number.

It is an amenable number.

394408493 is a deficient number, since it is larger than the sum of its proper divisors (17302507).

394408493 is a wasteful number, since it uses less digits than its factorization.

394408493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174847.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 394408493 is about 19859.7203656043. The cubic root of 394408493 is about 733.3569623011.

The spelling of 394408493 in words is "three hundred ninety-four million, four hundred eight thousand, four hundred ninety-three".