138702621 has 8 divisors (see below), whose sum is σ = 191314080. Its totient is φ = 89279792.

The previous prime is 138702617. The next prime is 138702623. The reversal of 138702621 is 126207831.

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 138702621 - 2² = 138702617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138702623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797055 + ... + 797228.

It is an arithmetic number, because the mean of its divisors is an integer number (23914260).

Almost surely, 2^138702621 is an apocalyptic number.

It is an amenable number.

138702621 is a deficient number, since it is larger than the sum of its proper divisors (52611459).

138702621 is a wasteful number, since it uses less digits than its factorization.

138702621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594315.

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

The square root of 138702621 is about 11777.2076911295. The cubic root of 138702621 is about 517.6404696974.

The spelling of 138702621 in words is "one hundred thirty-eight million, seven hundred two thousand, six hundred twenty-one".