138102391 has 16 divisors (see below), whose sum is σ = 162227520. Its totient is φ = 115096320.

The previous prime is 138102361. The next prime is 138102401. The reversal of 138102391 is 193201831.

It is a cyclic number.

It is not a de Polignac number, because 138102391 - 2⁹ = 138101879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138102301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111025 + ... + 112261.

It is an arithmetic number, because the mean of its divisors is an integer number (10139220).

Almost surely, 2^138102391 is an apocalyptic number.

138102391 is a deficient number, since it is larger than the sum of its proper divisors (24125129).

138102391 is a wasteful number, since it uses less digits than its factorization.

138102391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 138102391 is about 11751.6973667637. The cubic root of 138102391 is about 516.8927005904.

The spelling of 138102391 in words is "one hundred thirty-eight million, one hundred two thousand, three hundred ninety-one".