385778729 has 4 divisors (see below), whose sum is σ = 440889984. Its totient is φ = 330667476.

The previous prime is 385778693. The next prime is 385778741. The reversal of 385778729 is 927877583.

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 385778729 - 2¹⁶ = 385713193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385778749) 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, 27555617 + ... + 27555630.

It is an arithmetic number, because the mean of its divisors is an integer number (110222496).

Almost surely, 2^385778729 is an apocalyptic number.

It is an amenable number.

385778729 is a deficient number, since it is larger than the sum of its proper divisors (55111255).

385778729 is an equidigital number, since it uses as much as digits as its factorization.

385778729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55111254.

The product of its digits is 5927040, while the sum is 56.

The square root of 385778729 is about 19641.2506984662. The cubic root of 385778729 is about 727.9687882857.

The spelling of 385778729 in words is "three hundred eighty-five million, seven hundred seventy-eight thousand, seven hundred twenty-nine".