1381320136 has 32 divisors (see below), whose sum is σ = 2986179840. Its totient is φ = 586752768.

The previous prime is 1381320133. The next prime is 1381320163. The reversal of 1381320136 is 6310231831.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1381320133) 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, 102816 + ... + 115471.

It is an arithmetic number, because the mean of its divisors is an integer number (93318120).

Almost surely, 2^1381320136 is an apocalyptic number.

It is an amenable number.

1381320136 is an abundant number, since it is smaller than the sum of its proper divisors (1604859704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381320136 is a wasteful number, since it uses less digits than its factorization.

1381320136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218413 (or 218409 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1381320136 is about 37166.1154279002. The cubic root of 1381320136 is about 1113.6911817355.

Adding to 1381320136 its reverse (6310231831), we get a palindrome (7691551967).

The spelling of 1381320136 in words is "one billion, three hundred eighty-one million, three hundred twenty thousand, one hundred thirty-six".