138618001 has 4 divisors (see below), whose sum is σ = 138733492. Its totient is φ = 138502512.

The previous prime is 138617989. The next prime is 138618023. The reversal of 138618001 is 100816831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40132225 + 98485776 = 6335^2 + 9924^2 .

It is a cyclic number.

It is not a de Polignac number, because 138618001 - 2¹⁹ = 138093713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138618031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55926 + ... + 58351.

It is an arithmetic number, because the mean of its divisors is an integer number (34683373).

Almost surely, 2^138618001 is an apocalyptic number.

It is an amenable number.

138618001 is a deficient number, since it is larger than the sum of its proper divisors (115491).

138618001 is a wasteful number, since it uses less digits than its factorization.

138618001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115490.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 138618001 is about 11773.6146106453. The cubic root of 138618001 is about 517.5351805375.

The spelling of 138618001 in words is "one hundred thirty-eight million, six hundred eighteen thousand, one".