394105493 has 4 divisors (see below), whose sum is σ = 394191180. Its totient is φ = 394019808.

The previous prime is 394105469. The next prime is 394105507. The reversal of 394105493 is 394501493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 394501493 = 12589 ⋅31337.

It can be written as a sum of positive squares in 2 ways, for example, as 205262929 + 188842564 = 14327^2 + 13742^2 .

It is a cyclic number.

It is not a de Polignac number, because 394105493 - 2²⁶ = 326996629 is a prime.

It is a super-2 number, since 2×394105493² = 310638279225546098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394108493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35528 + ... + 45281.

It is an arithmetic number, because the mean of its divisors is an integer number (98547795).

Almost surely, 2^394105493 is an apocalyptic number.

It is an amenable number.

394105493 is a deficient number, since it is larger than the sum of its proper divisors (85687).

394105493 is an equidigital number, since it uses as much as digits as its factorization.

394105493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85686.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 394105493 is about 19852.0903937092. The cubic root of 394105493 is about 733.1691163744.

The spelling of 394105493 in words is "three hundred ninety-four million, one hundred five thousand, four hundred ninety-three".