1381563456 has 224 divisors, whose sum is σ = 4547128320. Its totient is φ = 360474624.

The previous prime is 1381563433. The next prime is 1381563457. The reversal of 1381563456 is 6543651831.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1381563457) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1869135 + ... + 1869873.

It is an arithmetic number, because the mean of its divisors is an integer number (20299680).

Almost surely, 2^1381563456 is an apocalyptic number.

1381563456 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 1381563456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2273564160).

1381563456 is an abundant number, since it is smaller than the sum of its proper divisors (3165564864).

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

1381563456 is a wasteful number, since it uses less digits than its factorization.

1381563456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 871 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 1381563456 is about 37169.3886955382. The cubic root of 1381563456 is about 1113.7565702533.

The spelling of 1381563456 in words is "one billion, three hundred eighty-one million, five hundred sixty-three thousand, four hundred fifty-six".