394878541 has 4 divisors (see below), whose sum is σ = 405550972. Its totient is φ = 384206112.

The previous prime is 394878521. The next prime is 394878553. The reversal of 394878541 is 145878493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145878493 = 7523 ⋅19391.

It can be written as a sum of positive squares in 2 ways, for example, as 342620100 + 52258441 = 18510^2 + 7229^2 .

It is a cyclic number.

It is not a de Polignac number, because 394878541 - 2⁵ = 394878509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394878511) 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, 5336160 + ... + 5336233.

It is an arithmetic number, because the mean of its divisors is an integer number (101387743).

Almost surely, 2^394878541 is an apocalyptic number.

It is an amenable number.

394878541 is a deficient number, since it is larger than the sum of its proper divisors (10672431).

394878541 is a wasteful number, since it uses less digits than its factorization.

394878541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10672430.

The product of its digits is 967680, while the sum is 49.

The square root of 394878541 is about 19871.5510466596. The cubic root of 394878541 is about 733.6481799341.

The spelling of 394878541 in words is "three hundred ninety-four million, eight hundred seventy-eight thousand, five hundred forty-one".