1381655280 has 160 divisors (see below), whose sum is σ = 4551833664. Its totient is φ = 345489408.

The previous prime is 1381655239. The next prime is 1381655299. The reversal of 1381655280 is 825561831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1619334 + ... + 1620186.

Almost surely, 2^1381655280 is an apocalyptic number.

1381655280 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 1381655280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2275916832).

1381655280 is an abundant number, since it is smaller than the sum of its proper divisors (3170178384).

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

1381655280 is a wasteful number, since it uses less digits than its factorization.

1381655280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 1381655280 is about 37170.6238849982. The cubic root of 1381655280 is about 1113.7812445494.

It can be divided in two parts, 13816 and 55280, that added together give a palindrome (69096).

The spelling of 1381655280 in words is "one billion, three hundred eighty-one million, six hundred fifty-five thousand, two hundred eighty".