394145771 has 4 divisors (see below), whose sum is σ = 394189200. Its totient is φ = 394102344.

The previous prime is 394145767. The next prime is 394145809. The reversal of 394145771 is 177541493.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 394145771 - 2² = 394145767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394145701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2336 + ... + 28173.

It is an arithmetic number, because the mean of its divisors is an integer number (98547300).

Almost surely, 2^394145771 is an apocalyptic number.

394145771 is a deficient number, since it is larger than the sum of its proper divisors (43429).

394145771 is a wasteful number, since it uses less digits than its factorization.

394145771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43428.

The product of its digits is 105840, while the sum is 41.

The square root of 394145771 is about 19853.1048201534. The cubic root of 394145771 is about 733.1940924110.

The spelling of 394145771 in words is "three hundred ninety-four million, one hundred forty-five thousand, seven hundred seventy-one".