394644919 has 4 divisors (see below), whose sum is σ = 417859344. Its totient is φ = 371430496.

The previous prime is 394644917. The next prime is 394644949. The reversal of 394644919 is 919446493.

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

It is a cyclic number.

It is not a de Polignac number, because 394644919 - 2¹ = 394644917 is a prime.

It is a super-2 number, since 2×394644919² = 311489224185033122, 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 (394644917) 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, 11607187 + ... + 11607220.

It is an arithmetic number, because the mean of its divisors is an integer number (104464836).

Almost surely, 2^394644919 is an apocalyptic number.

394644919 is a deficient number, since it is larger than the sum of its proper divisors (23214425).

394644919 is a wasteful number, since it uses less digits than its factorization.

394644919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23214424.

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

The square root of 394644919 is about 19865.6718738632. The cubic root of 394644919 is about 733.5034686289.

The spelling of 394644919 in words is "three hundred ninety-four million, six hundred forty-four thousand, nine hundred nineteen".