1381208544 has 96 divisors (see below), whose sum is σ = 4055940000. Its totient is φ = 457270272.

The previous prime is 1381208539. The next prime is 1381208611. The reversal of 1381208544 is 4458021831.

1381208544 is a `hidden beast` number, since 13 + 81 + 20 + 8 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1381208499 and 1381208508.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 123372 + ... + 134100.

It is an arithmetic number, because the mean of its divisors is an integer number (42249375).

Almost surely, 2^1381208544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381208544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2027970000).

1381208544 is an abundant number, since it is smaller than the sum of its proper divisors (2674731456).

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

1381208544 is a wasteful number, since it uses less digits than its factorization.

1381208544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10897 (or 10883 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 1381208544 is about 37164.6141376444. The cubic root of 1381208544 is about 1113.6611905288.

The spelling of 1381208544 in words is "one billion, three hundred eighty-one million, two hundred eight thousand, five hundred forty-four".