138598154 has 4 divisors (see below), whose sum is σ = 207897234. Its totient is φ = 69299076.

The previous prime is 138598133. The next prime is 138598157. The reversal of 138598154 is 451895831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 98465929 + 40132225 = 9923^2 + 6335^2 .

It is not an unprimeable number, because it can be changed into a prime (138598157) 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 as a sum of consecutive naturals, namely, 34649537 + ... + 34649540.

Almost surely, 2^138598154 is an apocalyptic number.

138598154 is a deficient number, since it is larger than the sum of its proper divisors (69299080).

138598154 is an equidigital number, since it uses as much as digits as its factorization.

138598154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69299079.

The product of its digits is 172800, while the sum is 44.

The square root of 138598154 is about 11772.7717212218. The cubic root of 138598154 is about 517.5104795345.

The spelling of 138598154 in words is "one hundred thirty-eight million, five hundred ninety-eight thousand, one hundred fifty-four".