1307638138 has 4 divisors (see below), whose sum is σ = 1961457210. Its totient is φ = 653819068.

The previous prime is 1307638117. The next prime is 1307638153. The reversal of 1307638138 is 8318367031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 686282809 + 621355329 = 26197^2 + 24927^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1307638138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326909533 + ... + 326909536.

Almost surely, 2^1307638138 is an apocalyptic number.

1307638138 is a deficient number, since it is larger than the sum of its proper divisors (653819072).

1307638138 is an equidigital number, since it uses as much as digits as its factorization.

1307638138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653819071.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 1307638138 is about 36161.2795404145. The cubic root of 1307638138 is about 1093.5262000090.

The spelling of 1307638138 in words is "one billion, three hundred seven million, six hundred thirty-eight thousand, one hundred thirty-eight".