1338763905 has 24 divisors (see below), whose sum is σ = 2337229440. Its totient is φ = 708867360.

The previous prime is 1338763901. The next prime is 1338763931. The reversal of 1338763905 is 5093678331.

1338763905 is a `hidden beast` number, since 1 + 3 + 3 + 8 + 7 + 639 + 0 + 5 = 666.

It is not a de Polignac number, because 1338763905 - 2² = 1338763901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1338763901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100761 + ... + 113270.

It is an arithmetic number, because the mean of its divisors is an integer number (97384560).

Almost surely, 2^1338763905 is an apocalyptic number.

1338763905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1338763905 is a deficient number, since it is larger than the sum of its proper divisors (998465535).

1338763905 is a wasteful number, since it uses less digits than its factorization.

1338763905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214181 (or 214178 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 1338763905 is about 36589.1227689323. The cubic root of 1338763905 is about 1102.1346715586.

The spelling of 1338763905 in words is "one billion, three hundred thirty-eight million, seven hundred sixty-three thousand, nine hundred five".