138091598 has 4 divisors (see below), whose sum is σ = 207137400. Its totient is φ = 69045798.

The previous prime is 138091589. The next prime is 138091631. The reversal of 138091598 is 895190831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 895190831 = 563 ⋅1590037.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 34522898 + ... + 34522901.

It is an arithmetic number, because the mean of its divisors is an integer number (51784350).

Almost surely, 2^138091598 is an apocalyptic number.

138091598 is a deficient number, since it is larger than the sum of its proper divisors (69045802).

138091598 is an equidigital number, since it uses as much as digits as its factorization.

138091598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69045801.

The product of its (nonzero) digits is 77760, while the sum is 44.

The square root of 138091598 is about 11751.2381475315. The cubic root of 138091598 is about 516.8792348128.

The spelling of 138091598 in words is "one hundred thirty-eight million, ninety-one thousand, five hundred ninety-eight".