1381939844 has 24 divisors (see below), whose sum is σ = 2549917440. Its totient is φ = 653513184.

The previous prime is 1381939841. The next prime is 1381939879. The reversal of 1381939844 is 4489391831.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1381939792 and 1381939801.

It is not an unprimeable number, because it can be changed into a prime (1381939841) 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, 31757 + ... + 61419.

It is an arithmetic number, because the mean of its divisors is an integer number (106246560).

Almost surely, 2^1381939844 is an apocalyptic number.

It is an amenable number.

1381939844 is a deficient number, since it is larger than the sum of its proper divisors (1167977596).

1381939844 is a wasteful number, since it uses less digits than its factorization.

1381939844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30299 (or 30297 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 1381939844 is about 37174.4514956173. The cubic root of 1381939844 is about 1113.8577036330.

The spelling of 1381939844 in words is "one billion, three hundred eighty-one million, nine hundred thirty-nine thousand, eight hundred forty-four".