1387531139 has 8 divisors (see below), whose sum is σ = 1435223040. Its totient is φ = 1340022600.

The previous prime is 1387531127. The next prime is 1387531157. The reversal of 1387531139 is 9311357831.

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

It is a cyclic number.

It is not a de Polignac number, because 1387531139 - 2¹⁶ = 1387465603 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1387531096 and 1387531105.

It is not an unprimeable number, because it can be changed into a prime (1387530139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30359 + ... + 60800.

It is an arithmetic number, because the mean of its divisors is an integer number (179402880).

Almost surely, 2^1387531139 is an apocalyptic number.

1387531139 is a deficient number, since it is larger than the sum of its proper divisors (47691901).

1387531139 is an equidigital number, since it uses as much as digits as its factorization.

1387531139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91681.

The product of its digits is 68040, while the sum is 41.

The square root of 1387531139 is about 37249.5790446013. The cubic root of 1387531139 is about 1115.3578959279.

The spelling of 1387531139 in words is "one billion, three hundred eighty-seven million, five hundred thirty-one thousand, one hundred thirty-nine".