138478501 has 8 divisors (see below), whose sum is σ = 158436864. Its totient is φ = 118564080.

The previous prime is 138478493. The next prime is 138478507. The reversal of 138478501 is 105874831.

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 138478501 - 2³ = 138478493 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 (138478507) 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, 3925 + ... + 17098.

It is an arithmetic number, because the mean of its divisors is an integer number (19804608).

Almost surely, 2^138478501 is an apocalyptic number.

It is an amenable number.

138478501 is a deficient number, since it is larger than the sum of its proper divisors (19958363).

138478501 is an equidigital number, since it uses as much as digits as its factorization.

138478501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21971.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 138478501 is about 11767.6888555060. The cubic root of 138478501 is about 517.3615128820.

The spelling of 138478501 in words is "one hundred thirty-eight million, four hundred seventy-eight thousand, five hundred one".