138621001 has 8 divisors (see below), whose sum is σ = 142369920. Its totient is φ = 134905488.

The previous prime is 138620987. The next prime is 138621013. The reversal of 138621001 is 100126831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138621001 - 2¹⁷ = 138489929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138621401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175 + ... + 16651.

It is an arithmetic number, because the mean of its divisors is an integer number (17796240).

Almost surely, 2^138621001 is an apocalyptic number.

It is an amenable number.

138621001 is a deficient number, since it is larger than the sum of its proper divisors (3748919).

138621001 is a wasteful number, since it uses less digits than its factorization.

138621001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16703.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 138621001 is about 11773.7420134807. The cubic root of 138621001 is about 517.5389140457.

Adding to 138621001 its reverse (100126831), we get a palindrome (238747832).

The spelling of 138621001 in words is "one hundred thirty-eight million, six hundred twenty-one thousand, one".