138078501 has 8 divisors (see below), whose sum is σ = 200841504. Its totient is φ = 83683920.

The previous prime is 138078497. The next prime is 138078503. The reversal of 138078501 is 105870831.

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

It is not a de Polignac number, because 138078501 - 2² = 138078497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 4184197 = 138078501 / (1 + 3 + 8 + 0 + 7 + 8 + 5 + 0 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138078503) 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, 2092066 + ... + 2092131.

It is an arithmetic number, because the mean of its divisors is an integer number (25105188).

Almost surely, 2^138078501 is an apocalyptic number.

138078501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

138078501 is a deficient number, since it is larger than the sum of its proper divisors (62763003).

138078501 is a wasteful number, since it uses less digits than its factorization.

138078501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184211.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 138078501 is about 11750.6808738898. The cubic root of 138078501 is about 516.8628935305.

The spelling of 138078501 in words is "one hundred thirty-eight million, seventy-eight thousand, five hundred one".