1381479440 has 80 divisors (see below), whose sum is σ = 3512025216. Its totient is φ = 501196800.

The previous prime is 1381479433. The next prime is 1381479469. The reversal of 1381479440 is 449741831.

It is a tau number, because it is divible by the number of its divisors (80).

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, 441080 + ... + 444200.

Almost surely, 2^1381479440 is an apocalyptic number.

1381479440 is a gapful number since it is divisible by the number (10) 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 1381479440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1756012608).

1381479440 is an abundant number, since it is smaller than the sum of its proper divisors (2130545776).

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

1381479440 is a wasteful number, since it uses less digits than its factorization.

1381479440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3648 (or 3642 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 1381479440 is about 37168.2585010382. The cubic root of 1381479440 is about 1113.7339931098.

The spelling of 1381479440 in words is "one billion, three hundred eighty-one million, four hundred seventy-nine thousand, four hundred forty".