138658501 has 8 divisors (see below), whose sum is σ = 139636224. Its totient is φ = 137684400.

The previous prime is 138658469. The next prime is 138658519. The reversal of 138658501 is 105856831.

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 138658501 - 2⁵ = 138658469 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 (138658301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155880 + ... + 156766.

It is an arithmetic number, because the mean of its divisors is an integer number (17454528).

Almost surely, 2^138658501 is an apocalyptic number.

It is an amenable number.

138658501 is a deficient number, since it is larger than the sum of its proper divisors (977723).

138658501 is an equidigital number, since it uses as much as digits as its factorization.

138658501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 138658501 is about 11775.3344326180. The cubic root of 138658501 is about 517.5855783543.

It can be divided in two parts, 13865 and 8501, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 138658501 in words is "one hundred thirty-eight million, six hundred fifty-eight thousand, five hundred one".