387128793 has 4 divisors (see below), whose sum is σ = 516171728. Its totient is φ = 258085860.

The previous prime is 387128779. The next prime is 387128803. The reversal of 387128793 is 397821783.

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 387128793 - 2¹⁴ = 387112409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387128723) 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, 64521463 + ... + 64521468.

It is an arithmetic number, because the mean of its divisors is an integer number (129042932).

Almost surely, 2^387128793 is an apocalyptic number.

It is an amenable number.

387128793 is a deficient number, since it is larger than the sum of its proper divisors (129042935).

387128793 is a wasteful number, since it uses less digits than its factorization.

387128793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129042934.

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

The square root of 387128793 is about 19675.5887586623. The cubic root of 387128793 is about 728.8169949010.

The spelling of 387128793 in words is "three hundred eighty-seven million, one hundred twenty-eight thousand, seven hundred ninety-three".