1378233638 has 8 divisors (see below), whose sum is σ = 2067512040. Its totient is φ = 689062960.

The previous prime is 1378233607. The next prime is 1378233641. The reversal of 1378233638 is 8363328731.

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

It is a Curzon number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 25373 + ... + 58311.

It is an arithmetic number, because the mean of its divisors is an integer number (258439005).

Almost surely, 2^1378233638 is an apocalyptic number.

1378233638 is a deficient number, since it is larger than the sum of its proper divisors (689278402).

1378233638 is a wasteful number, since it uses less digits than its factorization.

1378233638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53862.

The product of its digits is 435456, while the sum is 44.

The square root of 1378233638 is about 37124.5691961536. The cubic root of 1378233638 is about 1112.8610654477.

The spelling of 1378233638 in words is "one billion, three hundred seventy-eight million, two hundred thirty-three thousand, six hundred thirty-eight".