1378438897 has 24 divisors (see below), whose sum is σ = 1608768000. Its totient is φ = 1176109440.

The previous prime is 1378438891. The next prime is 1378438909. The reversal of 1378438897 is 7988348731.

It is not a de Polignac number, because 1378438897 - 2¹¹ = 1378436849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1378438891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 984604 + ... + 986002.

It is an arithmetic number, because the mean of its divisors is an integer number (67032000).

Almost surely, 2^1378438897 is an apocalyptic number.

1378438897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1378438897 is a deficient number, since it is larger than the sum of its proper divisors (230329103).

1378438897 is a wasteful number, since it uses less digits than its factorization.

1378438897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917 (or 1906 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 58.

The square root of 1378438897 is about 37127.3335562898. Note that the first 3 decimals coincide. The cubic root of 1378438897 is about 1112.9163084786.

The spelling of 1378438897 in words is "one billion, three hundred seventy-eight million, four hundred thirty-eight thousand, eight hundred ninety-seven".