1538604139 has 2 divisors, whose sum is σ = 1538604140. Its totient is φ = 1538604138.

The previous prime is 1538604131. The next prime is 1538604149. The reversal of 1538604139 is 9314068351.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1538604139 - 2³ = 1538604131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1538604131) by changing a digit.

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, 769302069 + 769302070.

It is an arithmetic number, because the mean of its divisors is an integer number (769302070).

Almost surely, 2^1538604139 is an apocalyptic number.

1538604139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538604139 is an equidigital number, since it uses as much as digits as its factorization.

1538604139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1538604139 is about 39225.0447928361. The cubic root of 1538604139 is about 1154.4513398933.

The spelling of 1538604139 in words is "one billion, five hundred thirty-eight million, six hundred four thousand, one hundred thirty-nine".