1381408138 has 16 divisors (see below), whose sum is σ = 2271206880. Its totient is φ = 624934800.

The previous prime is 1381408103. The next prime is 1381408139. The reversal of 1381408138 is 8318041831.

It is a junction number, because it is equal to n+sod(n) for n = 1381408097 and 1381408106.

It is not an unprimeable number, because it can be changed into a prime (1381408139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144153 + ... + 153436.

It is an arithmetic number, because the mean of its divisors is an integer number (141950430).

Almost surely, 2^1381408138 is an apocalyptic number.

1381408138 is a deficient number, since it is larger than the sum of its proper divisors (889798742).

1381408138 is a wasteful number, since it uses less digits than its factorization.

1381408138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297813.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1381408138 is about 37167.2993100118. The cubic root of 1381408138 is about 1113.7148318095.

Adding to 1381408138 its reverse (8318041831), we get a palindrome (9699449969).

The spelling of 1381408138 in words is "one billion, three hundred eighty-one million, four hundred eight thousand, one hundred thirty-eight".