1381556836 has 24 divisors (see below), whose sum is σ = 2643429600. Its totient is φ = 626572800.

The previous prime is 1381556821. The next prime is 1381556857. The reversal of 1381556836 is 6386551831.

It is an unprimeable number.

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, 15210 + ... + 54721.

It is an arithmetic number, because the mean of its divisors is an integer number (110142900).

Almost surely, 2^1381556836 is an apocalyptic number.

It is an amenable number.

1381556836 is a deficient number, since it is larger than the sum of its proper divisors (1261872764).

1381556836 is a wasteful number, since it uses less digits than its factorization.

1381556836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70395 (or 70393 counting only the distinct ones).

The product of its digits is 518400, while the sum is 46.

The square root of 1381556836 is about 37169.2996436575. The cubic root of 1381556836 is about 1113.7547913314.

It can be divided in two parts, 138155 and 6836, that added together give a triangular number (144991 = T₅₃₈).

The spelling of 1381556836 in words is "one billion, three hundred eighty-one million, five hundred fifty-six thousand, eight hundred thirty-six".