138290 has 8 divisors (see below), whose sum is σ = 248940. Its totient is φ = 55312.

The previous prime is 138289. The next prime is 138311. The reversal of 138290 is 92831.

It can be written as a sum of positive squares in 2 ways, for example, as 128881 + 9409 = 359^2 + 97^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6905 + ... + 6924.

2¹³⁸²⁹⁰ is an apocalyptic number.

138290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138290 is a deficient number, since it is larger than the sum of its proper divisors (110650).

138290 is a wasteful number, since it uses less digits than its factorization.

138290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13836.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 138290 is about 371.8736344513. The cubic root of 138290 is about 51.7126657060.

The spelling of 138290 in words is "one hundred thirty-eight thousand, two hundred ninety".