394370545 has 4 divisors (see below), whose sum is σ = 473244660. Its totient is φ = 315496432.

The previous prime is 394370533. The next prime is 394370563. The reversal of 394370545 is 545073493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545073493 = 1553 ⋅350981.

It can be written as a sum of positive squares in 2 ways, for example, as 306985441 + 87385104 = 17521^2 + 9348^2 .

It is a cyclic number.

It is not a de Polignac number, because 394370545 - 2⁹ = 394370033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 394370498 and 394370507.

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, 39437050 + ... + 39437059.

It is an arithmetic number, because the mean of its divisors is an integer number (118311165).

Almost surely, 2^394370545 is an apocalyptic number.

It is an amenable number.

394370545 is a deficient number, since it is larger than the sum of its proper divisors (78874115).

394370545 is an equidigital number, since it uses as much as digits as its factorization.

394370545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78874114.

The product of its (nonzero) digits is 226800, while the sum is 40.

The square root of 394370545 is about 19858.7649414560. The cubic root of 394370545 is about 733.3334415748. Note that the first 3 decimals are identical.

The spelling of 394370545 in words is "three hundred ninety-four million, three hundred seventy thousand, five hundred forty-five".