1378915650 has 288 divisors, whose sum is σ = 4541042688. Its totient is φ = 304430400.

The previous prime is 1378915639. The next prime is 1378915687. The reversal of 1378915650 is 565198731.

It is a happy number.

1378915650 is a `hidden beast` number, since 1 + 3 + 7 + 89 + 1 + 565 + 0 = 666.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1378915596 and 1378915605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2636289 + ... + 2636811.

Almost surely, 2^1378915650 is an apocalyptic number.

1378915650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1378915650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2270521344).

1378915650 is an abundant number, since it is smaller than the sum of its proper divisors (3162127038).

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

1378915650 is a wasteful number, since it uses less digits than its factorization.

1378915650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 1378915650 is about 37133.7535134815. The cubic root of 1378915650 is about 1113.0445997487.

The spelling of 1378915650 in words is "one billion, three hundred seventy-eight million, nine hundred fifteen thousand, six hundred fifty".