138023093 has 16 divisors (see below), whose sum is σ = 154450800. Its totient is φ = 122465280.

The previous prime is 138023089. The next prime is 138023111. The reversal of 138023093 is 390320831.

It can be written as a sum of positive squares in 8 ways, for example, as 47430769 + 90592324 = 6887^2 + 9518^2 .

It is a cyclic number.

It is not a de Polignac number, because 138023093 - 2² = 138023089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138023003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100733 + ... + 102093.

It is an arithmetic number, because the mean of its divisors is an integer number (9653175).

Almost surely, 2^138023093 is an apocalyptic number.

138023093 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138023093 is a deficient number, since it is larger than the sum of its proper divisors (16427707).

138023093 is a wasteful number, since it uses less digits than its factorization.

138023093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 138023093 is about 11748.3229867075. The cubic root of 138023093 is about 516.7937488760.

The spelling of 138023093 in words is "one hundred thirty-eight million, twenty-three thousand, ninety-three".