387138839 has 4 divisors (see below), whose sum is σ = 387975456. Its totient is φ = 386302224.

The previous prime is 387138823. The next prime is 387138877. The reversal of 387138839 is 938831783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938831783 = 17 ⋅55225399.

It is a cyclic number.

It is not a de Polignac number, because 387138839 - 2⁴ = 387138823 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 (387132839) 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, 417614 + ... + 418539.

It is an arithmetic number, because the mean of its divisors is an integer number (96993864).

Almost surely, 2^387138839 is an apocalyptic number.

387138839 is a deficient number, since it is larger than the sum of its proper divisors (836617).

387138839 is an equidigital number, since it uses as much as digits as its factorization.

387138839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836616.

The product of its digits is 870912, while the sum is 50.

The square root of 387138839 is about 19675.8440479691. The cubic root of 387138839 is about 728.8232991184.

The spelling of 387138839 in words is "three hundred eighty-seven million, one hundred thirty-eight thousand, eight hundred thirty-nine".