393866149 has 4 divisors (see below), whose sum is σ = 417034764. Its totient is φ = 370697536.

The previous prime is 393866117. The next prime is 393866201. The reversal of 393866149 is 941668393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 941668393 = 449 ⋅2097257.

It can be written as a sum of positive squares in 2 ways, for example, as 288660100 + 105206049 = 16990^2 + 10257^2 .

It is a cyclic number.

It is not a de Polignac number, because 393866149 - 2⁵ = 393866117 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393846149) 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, 11584282 + ... + 11584315.

It is an arithmetic number, because the mean of its divisors is an integer number (104258691).

Almost surely, 2^393866149 is an apocalyptic number.

It is an amenable number.

393866149 is a deficient number, since it is larger than the sum of its proper divisors (23168615).

393866149 is a wasteful number, since it uses less digits than its factorization.

393866149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23168614.

The product of its digits is 839808, while the sum is 49.

The square root of 393866149 is about 19846.0612968921. The cubic root of 393866149 is about 733.0206661349.

The spelling of 393866149 in words is "three hundred ninety-three million, eight hundred sixty-six thousand, one hundred forty-nine".