394181143 has 4 divisors (see below), whose sum is σ = 394301448. Its totient is φ = 394060840.

The previous prime is 394181119. The next prime is 394181171. The reversal of 394181143 is 341181493.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394181143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 394181099 and 394181108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394181443) 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, 55096 + ... + 61837.

It is an arithmetic number, because the mean of its divisors is an integer number (98575362).

Almost surely, 2^394181143 is an apocalyptic number.

394181143 is a deficient number, since it is larger than the sum of its proper divisors (120305).

394181143 is a wasteful number, since it uses less digits than its factorization.

394181143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120304.

The product of its digits is 10368, while the sum is 34.

The square root of 394181143 is about 19853.9956431948. The cubic root of 394181143 is about 733.2160248766.

The spelling of 394181143 in words is "three hundred ninety-four million, one hundred eighty-one thousand, one hundred forty-three".