1378345518 has 128 divisors (see below), whose sum is σ = 3509775360. Its totient is φ = 396887040.

The previous prime is 1378345517. The next prime is 1378345531. The reversal of 1378345518 is 8155438731.

It is a happy number.

1378345518 is a `hidden beast` number, since 13 + 7 + 83 + 4 + 551 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378345513) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3183030 + ... + 3183462.

It is an arithmetic number, because the mean of its divisors is an integer number (27420120).

Almost surely, 2^1378345518 is an apocalyptic number.

1378345518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1378345518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1754887680).

1378345518 is an abundant number, since it is smaller than the sum of its proper divisors (2131429842).

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

1378345518 is a wasteful number, since it uses less digits than its factorization.

1378345518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711 (or 705 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 1378345518 is about 37126.0759844075. The cubic root of 1378345518 is about 1112.8911773057.

It can be divided in two parts, 137 and 8345518, that added together give a triangular number (8345655 = T₄₀₈₅).

The spelling of 1378345518 in words is "one billion, three hundred seventy-eight million, three hundred forty-five thousand, five hundred eighteen".