1378726380 has 96 divisors (see below), whose sum is σ = 4311921600. Its totient is φ = 365727744.

The previous prime is 1378726373. The next prime is 1378726397. The reversal of 1378726380 is 836278731.

1378726380 is a `hidden beast` number, since 1 + 3 + 7 + 8 + 7 + 2 + 638 + 0 = 666.

1378726380 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 97606 + ... + 110834.

It is an arithmetic number, because the mean of its divisors is an integer number (44915850).

Almost surely, 2^1378726380 is an apocalyptic number.

1378726380 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 1378726380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2155960800).

1378726380 is an abundant number, since it is smaller than the sum of its proper divisors (2933195220).

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

1378726380 is a wasteful number, since it uses less digits than its factorization.

1378726380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13440 (or 13432 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 1378726380 is about 37131.2049360104. The cubic root of 1378726380 is about 1112.9936719077.

The spelling of 1378726380 in words is "one billion, three hundred seventy-eight million, seven hundred twenty-six thousand, three hundred eighty".