1378633305 has 16 divisors (see below), whose sum is σ = 2520929664. Its totient is φ = 630232320.

The previous prime is 1378633303. The next prime is 1378633327. The reversal of 1378633305 is 5033368731.

It is not a de Polignac number, because 1378633305 - 2¹ = 1378633303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1378633303) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6564816 + ... + 6565025.

It is an arithmetic number, because the mean of its divisors is an integer number (157558104).

Almost surely, 2^1378633305 is an apocalyptic number.

1378633305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1378633305 is a deficient number, since it is larger than the sum of its proper divisors (1142296359).

1378633305 is a wasteful number, since it uses less digits than its factorization.

1378633305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13129856.

The product of its (nonzero) digits is 136080, while the sum is 39.

The square root of 1378633305 is about 37129.9515889800. The cubic root of 1378633305 is about 1112.9686260348.

The spelling of 1378633305 in words is "one billion, three hundred seventy-eight million, six hundred thirty-three thousand, three hundred five".