394877789 has 4 divisors (see below), whose sum is σ = 400439520. Its totient is φ = 389316060.

The previous prime is 394877773. The next prime is 394877797. The reversal of 394877789 is 987778493.

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 a cyclic number.

It is not a de Polignac number, because 394877789 - 2⁴ = 394877773 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 (394877089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2780759 + ... + 2780900.

It is an arithmetic number, because the mean of its divisors is an integer number (100109880).

Almost surely, 2^394877789 is an apocalyptic number.

It is an amenable number.

394877789 is a deficient number, since it is larger than the sum of its proper divisors (5561731).

394877789 is an equidigital number, since it uses as much as digits as its factorization.

394877789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561730.

The product of its digits is 21337344, while the sum is 62.

The square root of 394877789 is about 19871.5321251281. The cubic root of 394877789 is about 733.6477142181.

The spelling of 394877789 in words is "three hundred ninety-four million, eight hundred seventy-seven thousand, seven hundred eighty-nine".