1378438898 has 8 divisors (see below), whose sum is σ = 2157556608. Its totient is φ = 659253364.

The previous prime is 1378438891. The next prime is 1378438909. The reversal of 1378438898 is 8988348731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 14982986 + ... + 14983077.

It is an arithmetic number, because the mean of its divisors is an integer number (269694576).

Almost surely, 2^1378438898 is an apocalyptic number.

1378438898 is a deficient number, since it is larger than the sum of its proper divisors (779117710).

1378438898 is a wasteful number, since it uses less digits than its factorization.

1378438898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29966088.

The product of its digits is 9289728, while the sum is 59.

The square root of 1378438898 is about 37127.3335697569. Note that the first 3 decimals coincide. The cubic root of 1378438898 is about 1112.9163087478.

The spelling of 1378438898 in words is "one billion, three hundred seventy-eight million, four hundred thirty-eight thousand, eight hundred ninety-eight".