1378638052 has 24 divisors (see below), whose sum is σ = 2786767200. Its totient is φ = 589791360.

The previous prime is 1378638049. The next prime is 1378638071. The reversal of 1378638052 is 2508368731.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 920802 + ... + 922297.

It is an arithmetic number, because the mean of its divisors is an integer number (116115300).

Almost surely, 2^1378638052 is an apocalyptic number.

It is an amenable number.

1378638052 is an abundant number, since it is smaller than the sum of its proper divisors (1408129148).

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

1378638052 is a wasteful number, since it uses less digits than its factorization.

1378638052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843131 (or 1843129 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 1378638052 is about 37130.0155130590. The cubic root of 1378638052 is about 1112.9699034487.

The spelling of 1378638052 in words is "one billion, three hundred seventy-eight million, six hundred thirty-eight thousand, fifty-two".