394005845 has 4 divisors (see below), whose sum is σ = 472807020. Its totient is φ = 315204672.

The previous prime is 394005811. The next prime is 394005853. The reversal of 394005845 is 548500493.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 134699236 + 259306609 = 11606^2 + 16103^2 .

It is a cyclic number.

It is not a de Polignac number, because 394005845 - 2¹⁴ = 393989461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 394005799 and 394005808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39400580 + ... + 39400589.

It is an arithmetic number, because the mean of its divisors is an integer number (118201755).

Almost surely, 2^394005845 is an apocalyptic number.

It is an amenable number.

394005845 is a deficient number, since it is larger than the sum of its proper divisors (78801175).

394005845 is an equidigital number, since it uses as much as digits as its factorization.

394005845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78801174.

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 394005845 is about 19849.5804741561. The cubic root of 394005845 is about 733.1073182046.

The spelling of 394005845 in words is "three hundred ninety-four million, five thousand, eight hundred forty-five".