387831089 has 4 divisors (see below), whose sum is σ = 389539824. Its totient is φ = 386122356.

The previous prime is 387830999. The next prime is 387831137. The reversal of 387831089 is 980138783.

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 a de Polignac number, because none of the positive numbers 2^k-387831089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387831289) 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, 854027 + ... + 854480.

It is an arithmetic number, because the mean of its divisors is an integer number (97384956).

Almost surely, 2^387831089 is an apocalyptic number.

It is an amenable number.

387831089 is a deficient number, since it is larger than the sum of its proper divisors (1708735).

387831089 is a wasteful number, since it uses less digits than its factorization.

387831089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708734.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 387831089 is about 19693.4275584521. The cubic root of 387831089 is about 729.2574478508.

The spelling of 387831089 in words is "three hundred eighty-seven million, eight hundred thirty-one thousand, eighty-nine".