138270621 has 8 divisors (see below), whose sum is σ = 185235424. Its totient is φ = 91743120.

The previous prime is 138270607. The next prime is 138270679. The reversal of 138270621 is 126072831.

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

It is not a de Polignac number, because 138270621 - 2⁵ = 138270589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138270421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108586 + ... + 109851.

It is an arithmetic number, because the mean of its divisors is an integer number (23154428).

Almost surely, 2^138270621 is an apocalyptic number.

It is an amenable number.

138270621 is a deficient number, since it is larger than the sum of its proper divisors (46964803).

138270621 is a wasteful number, since it uses less digits than its factorization.

138270621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218651.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 138270621 is about 11758.8528777258. The cubic root of 138270621 is about 517.1025004191.

The spelling of 138270621 in words is "one hundred thirty-eight million, two hundred seventy thousand, six hundred twenty-one".