138664607 has 8 divisors (see below), whose sum is σ = 141299376. Its totient is φ = 136046592.

The previous prime is 138664601. The next prime is 138664613. The reversal of 138664607 is 706466831.

It is an interprime number because it is at equal distance from previous prime (138664601) and next prime (138664613).

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 138664607 - 2⁶ = 138664543 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 (138664601) 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, 13193 + ... + 21245.

It is an arithmetic number, because the mean of its divisors is an integer number (17662422).

Almost surely, 2^138664607 is an apocalyptic number.

138664607 is a deficient number, since it is larger than the sum of its proper divisors (2634769).

138664607 is an equidigital number, since it uses as much as digits as its factorization.

138664607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8377.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 138664607 is about 11775.5937005316. The cubic root of 138664607 is about 517.5931757515.

The spelling of 138664607 in words is "one hundred thirty-eight million, six hundred sixty-four thousand, six hundred seven".