138578361 has 4 divisors (see below), whose sum is σ = 184771152. Its totient is φ = 92385572.

The previous prime is 138578359. The next prime is 138578383. The reversal of 138578361 is 163875831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138578361 - 2¹ = 138578359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138578261) 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 3 ways as a sum of consecutive naturals, for example, 23096391 + ... + 23096396.

It is an arithmetic number, because the mean of its divisors is an integer number (46192788).

Almost surely, 2^138578361 is an apocalyptic number.

It is an amenable number.

138578361 is a deficient number, since it is larger than the sum of its proper divisors (46192791).

138578361 is an equidigital number, since it uses as much as digits as its factorization.

138578361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46192790.

The product of its digits is 120960, while the sum is 42.

The square root of 138578361 is about 11771.9310650377. The cubic root of 138578361 is about 517.4858433897.

The spelling of 138578361 in words is "one hundred thirty-eight million, five hundred seventy-eight thousand, three hundred sixty-one".