138723285 has 8 divisors (see below), whose sum is σ = 221957280. Its totient is φ = 73985744.

The previous prime is 138723283. The next prime is 138723293. The reversal of 138723285 is 582327831.

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

It is a cyclic number.

It is not a de Polignac number, because 138723285 - 2¹ = 138723283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138723283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4624095 + ... + 4624124.

It is an arithmetic number, because the mean of its divisors is an integer number (27744660).

Almost surely, 2^138723285 is an apocalyptic number.

138723285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138723285 is a deficient number, since it is larger than the sum of its proper divisors (83233995).

138723285 is an equidigital number, since it uses as much as digits as its factorization.

138723285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248227.

The product of its digits is 80640, while the sum is 39.

The square root of 138723285 is about 11778.0849462041. The cubic root of 138723285 is about 517.6661745506. Note that the first 3 decimals are identical.

The spelling of 138723285 in words is "one hundred thirty-eight million, seven hundred twenty-three thousand, two hundred eighty-five".