1381120880 has 20 divisors (see below), whose sum is σ = 3211106232. Its totient is φ = 552448320.

The previous prime is 1381120879. The next prime is 1381120883. The reversal of 1381120880 is 880211831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381120883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8631926 + ... + 8632085.

Almost surely, 2^1381120880 is an apocalyptic number.

1381120880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381120880 is an abundant number, since it is smaller than the sum of its proper divisors (1829985352).

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

1381120880 is a wasteful number, since it uses less digits than its factorization.

1381120880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17264024 (or 17264018 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 1381120880 is about 37163.4347174746. The cubic root of 1381120880 is about 1113.6376290228.

The spelling of 1381120880 in words is "one billion, three hundred eighty-one million, one hundred twenty thousand, eight hundred eighty".