1387738639 has 16 divisors (see below), whose sum is σ = 1617856000. Its totient is φ = 1165770144.

The previous prime is 1387738633. The next prime is 1387738657. The reversal of 1387738639 is 9368377831.

It is not a de Polignac number, because 1387738639 - 2³ = 1387738631 is a prime.

It is a super-3 number, since 3×1387738639³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1387738639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387738631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85897 + ... + 100765.

It is an arithmetic number, because the mean of its divisors is an integer number (101116000).

Almost surely, 2^1387738639 is an apocalyptic number.

1387738639 is a deficient number, since it is larger than the sum of its proper divisors (230117361).

1387738639 is a wasteful number, since it uses less digits than its factorization.

1387738639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15142.

The product of its digits is 4572288, while the sum is 55.

The square root of 1387738639 is about 37252.3642068527. The cubic root of 1387738639 is about 1115.4134923324.

The spelling of 1387738639 in words is "one billion, three hundred eighty-seven million, seven hundred thirty-eight thousand, six hundred thirty-nine".