1381319644 has 6 divisors (see below), whose sum is σ = 2417309384. Its totient is φ = 690659820.

The previous prime is 1381319593. The next prime is 1381319647. The reversal of 1381319644 is 4469131831.

It is a junction number, because it is equal to n+sod(n) for n = 1381319597 and 1381319606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381319647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172664952 + ... + 172664959.

Almost surely, 2^1381319644 is an apocalyptic number.

It is an amenable number.

1381319644 is a deficient number, since it is larger than the sum of its proper divisors (1035989740).

1381319644 is a wasteful number, since it uses less digits than its factorization.

1381319644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345329915 (or 345329913 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 1381319644 is about 37166.1088089673. The cubic root of 1381319644 is about 1113.6910495103.

The spelling of 1381319644 in words is "one billion, three hundred eighty-one million, three hundred nineteen thousand, six hundred forty-four".