1378421880 has 512 divisors, whose sum is σ = 5206809600. Its totient is φ = 287539200.

The previous prime is 1378421879. The next prime is 1378421909. The reversal of 1378421880 is 881248731.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 22597050 + ... + 22597110.

It is an arithmetic number, because the mean of its divisors is an integer number (10169550).

Almost surely, 2^1378421880 is an apocalyptic number.

1378421880 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 1378421880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2603404800).

1378421880 is an abundant number, since it is smaller than the sum of its proper divisors (3828387720).

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

1378421880 is a wasteful number, since it uses less digits than its factorization.

1378421880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 1378421880 is about 37127.1043848022. The cubic root of 1378421880 is about 1112.9117287629.

The spelling of 1378421880 in words is "one billion, three hundred seventy-eight million, four hundred twenty-one thousand, eight hundred eighty".