138280545 has 24 divisors (see below), whose sum is σ = 258124776. Its totient is φ = 68076288.

The previous prime is 138280517. The next prime is 138280547. The reversal of 138280545 is 545082831.

It is a happy number.

138280545 is a `hidden beast` number, since 1 + 38 + 2 + 80 + 545 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13198689 + 125081856 = 3633^2 + 11184^2 .

It is not a de Polignac number, because 138280545 - 2⁶ = 138280481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138280547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117604 + ... + 118773.

It is an arithmetic number, because the mean of its divisors is an integer number (10755199).

Almost surely, 2^138280545 is an apocalyptic number.

138280545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138280545 is a deficient number, since it is larger than the sum of its proper divisors (119844231).

138280545 is a wasteful number, since it uses less digits than its factorization.

138280545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236401 (or 236398 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 138280545 is about 11759.2748500917. The cubic root of 138280545 is about 517.1148713345.

The spelling of 138280545 in words is "one hundred thirty-eight million, two hundred eighty thousand, five hundred forty-five".