1387557886 has 32 divisors (see below), whose sum is σ = 2451254400. Its totient is φ = 580752480.

The previous prime is 1387557883. The next prime is 1387557887. The reversal of 1387557886 is 6887557831.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1387557886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387557883) 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 15 ways as a sum of consecutive naturals, for example, 114045 + ... + 125623.

It is an arithmetic number, because the mean of its divisors is an integer number (76601700).

Almost surely, 2^1387557886 is an apocalyptic number.

1387557886 is a deficient number, since it is larger than the sum of its proper divisors (1063696514).

1387557886 is a wasteful number, since it uses less digits than its factorization.

1387557886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12024.

The product of its digits is 11289600, while the sum is 58.

The square root of 1387557886 is about 37249.9380670626. The cubic root of 1387557886 is about 1115.3650626826.

Subtracting 1387557886 from its reverse (6887557831), we obtain a palindrome (5499999945).

It can be divided in two parts, 138755 and 7886, that added together give a palindrome (146641).

The spelling of 1387557886 in words is "one billion, three hundred eighty-seven million, five hundred fifty-seven thousand, eight hundred eighty-six".