394380919 has 4 divisors (see below), whose sum is σ = 394523640. Its totient is φ = 394238200.

The previous prime is 394380911. The next prime is 394380953. The reversal of 394380919 is 919083493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919083493 = 1091 ⋅842423.

It is a cyclic number.

It is not a de Polignac number, because 394380919 - 2³ = 394380911 is a prime.

It is a super-2 number, since 2×394380919² = 311072618542569122, 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 (394380911) 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, 67132 + ... + 72769.

It is an arithmetic number, because the mean of its divisors is an integer number (98630910).

Almost surely, 2^394380919 is an apocalyptic number.

394380919 is a deficient number, since it is larger than the sum of its proper divisors (142721).

394380919 is a wasteful number, since it uses less digits than its factorization.

394380919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142720.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 394380919 is about 19859.0261342292. The cubic root of 394380919 is about 733.3398716818.

The spelling of 394380919 in words is "three hundred ninety-four million, three hundred eighty thousand, nine hundred nineteen".