1381744656 has 120 divisors (see below), whose sum is σ = 4024054944. Its totient is φ = 458991360.

The previous prime is 1381744601. The next prime is 1381744739. The reversal of 1381744656 is 6564471831.

1381744656 is a `hidden beast` number, since 13 + 8 + 174 + 465 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1815316 + ... + 1816076.

Almost surely, 2^1381744656 is an apocalyptic number.

1381744656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381744656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2012027472).

1381744656 is an abundant number, since it is smaller than the sum of its proper divisors (2642310288).

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

1381744656 is an equidigital number, since it uses as much as digits as its factorization.

1381744656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251 (or 1233 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 1381744656 is about 37171.8261052642. The cubic root of 1381744656 is about 1113.8052599865.

The spelling of 1381744656 in words is "one billion, three hundred eighty-one million, seven hundred forty-four thousand, six hundred fifty-six".