1538388686 has 8 divisors (see below), whose sum is σ = 2308436184. Its totient is φ = 768909960.

The previous prime is 1538388679. The next prime is 1538388689. The reversal of 1538388686 is 6868838351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538388689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135365 + ... + 146288.

It is an arithmetic number, because the mean of its divisors is an integer number (288554523).

Almost surely, 2^1538388686 is an apocalyptic number.

1538388686 is a deficient number, since it is larger than the sum of its proper divisors (770047498).

1538388686 is a wasteful number, since it uses less digits than its factorization.

1538388686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284386.

The product of its digits is 6635520, while the sum is 56.

The square root of 1538388686 is about 39222.2983263347. The cubic root of 1538388686 is about 1154.3974508716.

The spelling of 1538388686 in words is "one billion, five hundred thirty-eight million, three hundred eighty-eight thousand, six hundred eighty-six".