138320145 has 24 divisors (see below), whose sum is σ = 241652736. Its totient is φ = 73186848.

The previous prime is 138320129. The next prime is 138320153. The reversal of 138320145 is 541023831.

It is a happy number.

It is not a de Polignac number, because 138320145 - 2⁴ = 138320129 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6387 + ... + 17816.

It is an arithmetic number, because the mean of its divisors is an integer number (10068864).

Almost surely, 2^138320145 is an apocalyptic number.

138320145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138320145 is a deficient number, since it is larger than the sum of its proper divisors (103332591).

138320145 is a wasteful number, since it uses less digits than its factorization.

138320145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24341 (or 24338 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 138320145 is about 11760.9585068565. The cubic root of 138320145 is about 517.1642294334.

Adding to 138320145 its reverse (541023831), we get a palindrome (679343976).

It can be divided in two parts, 1383 and 20145, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 138320145 in words is "one hundred thirty-eight million, three hundred twenty thousand, one hundred forty-five".