1378221438 has 16 divisors (see below), whose sum is σ = 3007028736. Its totient is φ = 417642840.

The previous prime is 1378221421. The next prime is 1378221443. The reversal of 1378221438 is 8341228731.

It is a junction number, because it is equal to n+sod(n) for n = 1378221396 and 1378221405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10441006 + ... + 10441137.

It is an arithmetic number, because the mean of its divisors is an integer number (187939296).

Almost surely, 2^1378221438 is an apocalyptic number.

1378221438 is an abundant number, since it is smaller than the sum of its proper divisors (1628807298).

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

1378221438 is a wasteful number, since it uses less digits than its factorization.

1378221438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20882159.

The product of its digits is 64512, while the sum is 39.

The square root of 1378221438 is about 37124.4048841190. The cubic root of 1378221438 is about 1112.8577817893.

The spelling of 1378221438 in words is "one billion, three hundred seventy-eight million, two hundred twenty-one thousand, four hundred thirty-eight".