138763889 has 6 divisors (see below), whose sum is σ = 152525730. Its totient is φ = 126148880.

The previous prime is 138763879. The next prime is 138763903. The reversal of 138763889 is 988367831.

It can be written as a sum of positive squares in only one way, i.e., 108513889 + 30250000 = 10417^2 + 5500^2 .

It is not a de Polignac number, because 138763889 - 2⁴ = 138763873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138763889.

It is not an unprimeable number, because it can be changed into a prime (138763879) 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 5 ways as a sum of consecutive naturals, for example, 573284 + ... + 573525.

It is an arithmetic number, because the mean of its divisors is an integer number (25420955).

Almost surely, 2^138763889 is an apocalyptic number.

It is an amenable number.

138763889 is a deficient number, since it is larger than the sum of its proper divisors (13761841).

138763889 is a wasteful number, since it uses less digits than its factorization.

138763889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146831 (or 1146820 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 53.

The square root of 138763889 is about 11779.8085298531. The cubic root of 138763889 is about 517.7166762067.

The spelling of 138763889 in words is "one hundred thirty-eight million, seven hundred sixty-three thousand, eight hundred eighty-nine".