138655245 has 8 divisors (see below), whose sum is σ = 221848416. Its totient is φ = 73949456.

The previous prime is 138655211. The next prime is 138655249. The reversal of 138655245 is 542556831.

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 138655245 - 2¹⁷ = 138524173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138655249) 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, 4621827 + ... + 4621856.

It is an arithmetic number, because the mean of its divisors is an integer number (27731052).

Almost surely, 2^138655245 is an apocalyptic number.

138655245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138655245 is a deficient number, since it is larger than the sum of its proper divisors (83193171).

138655245 is an equidigital number, since it uses as much as digits as its factorization.

138655245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9243691.

The product of its digits is 144000, while the sum is 39.

The square root of 138655245 is about 11775.1961767098. The cubic root of 138655245 is about 517.5815269815.

It can be divided in two parts, 13865 and 5245, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 138655245 in words is "one hundred thirty-eight million, six hundred fifty-five thousand, two hundred forty-five".