1538765538 has 16 divisors (see below), whose sum is σ = 3176806656. Its totient is φ = 496375920.

The previous prime is 1538765537. The next prime is 1538765539. The reversal of 1538765538 is 8355678351.

It is an interprime number because it is at equal distance from previous prime (1538765537) and next prime (1538765539).

It is not an unprimeable number, because it can be changed into a prime (1538765537) 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 in 7 ways as a sum of consecutive naturals, for example, 4136281 + ... + 4136652.

It is an arithmetic number, because the mean of its divisors is an integer number (198550416).

Almost surely, 2^1538765538 is an apocalyptic number.

1538765538 is an abundant number, since it is smaller than the sum of its proper divisors (1638041118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1538765538 is a wasteful number, since it uses less digits than its factorization.

1538765538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272969.

The product of its digits is 3024000, while the sum is 51.

The square root of 1538765538 is about 39227.1020851656. The cubic root of 1538765538 is about 1154.4917056535.

The spelling of 1538765538 in words is "one billion, five hundred thirty-eight million, seven hundred sixty-five thousand, five hundred thirty-eight".