138090154 has 4 divisors (see below), whose sum is σ = 207135234. Its totient is φ = 69045076.

The previous prime is 138090107. The next prime is 138090163. The reversal of 138090154 is 451090831.

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., 126000625 + 12089529 = 11225^2 + 3477^2 .

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, 34522537 + ... + 34522540.

Almost surely, 2^138090154 is an apocalyptic number.

138090154 is a deficient number, since it is larger than the sum of its proper divisors (69045080).

138090154 is an equidigital number, since it uses as much as digits as its factorization.

138090154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69045079.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 138090154 is about 11751.1767070366. The cubic root of 138090154 is about 516.8774331675.

The spelling of 138090154 in words is "one hundred thirty-eight million, ninety thousand, one hundred fifty-four".