394445146 has 4 divisors (see below), whose sum is σ = 591667722. Its totient is φ = 197222572.

The previous prime is 394445143. The next prime is 394445159. The reversal of 394445146 is 641544493.

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

It can be written as a sum of positive squares in only one way, i.e., 322382025 + 72063121 = 17955^2 + 8489^2 .

It is a super-2 number, since 2×394445146² = 311173946405922632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 394445099 and 394445108.

It is not an unprimeable number, because it can be changed into a prime (394445143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98611285 + ... + 98611288.

Almost surely, 2^394445146 is an apocalyptic number.

394445146 is a deficient number, since it is larger than the sum of its proper divisors (197222576).

394445146 is a wasteful number, since it uses less digits than its factorization.

394445146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197222575.

The product of its digits is 207360, while the sum is 40.

The square root of 394445146 is about 19860.6431416508. The cubic root of 394445146 is about 733.3796789351.

The spelling of 394445146 in words is "three hundred ninety-four million, four hundred forty-five thousand, one hundred forty-six".