394548789 has 4 divisors (see below), whose sum is σ = 526065056. Its totient is φ = 263032524.

The previous prime is 394548787. The next prime is 394548809. The reversal of 394548789 is 987845493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 394548789 - 2¹ = 394548787 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 (394548787) 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, 65758129 + ... + 65758134.

It is an arithmetic number, because the mean of its divisors is an integer number (131516264).

Almost surely, 2^394548789 is an apocalyptic number.

It is an amenable number.

394548789 is a deficient number, since it is larger than the sum of its proper divisors (131516267).

394548789 is a wasteful number, since it uses less digits than its factorization.

394548789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131516266.

The product of its digits is 8709120, while the sum is 57.

The square root of 394548789 is about 19863.2522261587. The cubic root of 394548789 is about 733.4439067197.

The spelling of 394548789 in words is "three hundred ninety-four million, five hundred forty-eight thousand, seven hundred eighty-nine".