389772813 has 4 divisors (see below), whose sum is σ = 519697088. Its totient is φ = 259848540.

The previous prime is 389772811. The next prime is 389772829. The reversal of 389772813 is 318277983.

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 389772813 - 2¹ = 389772811 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 (389772811) 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, 64962133 + ... + 64962138.

It is an arithmetic number, because the mean of its divisors is an integer number (129924272).

Almost surely, 2^389772813 is an apocalyptic number.

It is an amenable number.

389772813 is a deficient number, since it is larger than the sum of its proper divisors (129924275).

389772813 is a wasteful number, since it uses less digits than its factorization.

389772813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129924274.

The product of its digits is 508032, while the sum is 48.

The square root of 389772813 is about 19742.6647897390. The cubic root of 389772813 is about 730.4724614019.

The spelling of 389772813 in words is "three hundred eighty-nine million, seven hundred seventy-two thousand, eight hundred thirteen".