138900245 has 16 divisors (see below), whose sum is σ = 182710080. Its totient is φ = 100531200.

The previous prime is 138900221. The next prime is 138900247. The reversal of 138900245 is 542009831.

It is a de Polignac number, because none of the positive numbers 2^k-138900245 is a prime.

It is a super-2 number, since 2×138900245² = 38586556122120050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138900247) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 5621 + ... + 17589.

It is an arithmetic number, because the mean of its divisors is an integer number (11419380).

Almost surely, 2^138900245 is an apocalyptic number.

It is an amenable number.

138900245 is a deficient number, since it is larger than the sum of its proper divisors (43809835).

138900245 is a wasteful number, since it uses less digits than its factorization.

138900245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12196.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 138900245 is about 11785.5948089182. The cubic root of 138900245 is about 517.8861983720.

The spelling of 138900245 in words is "one hundred thirty-eight million, nine hundred thousand, two hundred forty-five".