138378554 has 8 divisors (see below), whose sum is σ = 207618528. Its totient is φ = 69172380.

The previous prime is 138378553. The next prime is 138378571. The reversal of 138378554 is 455873831.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (138378553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8969 + ... + 18899.

It is an arithmetic number, because the mean of its divisors is an integer number (25952316).

Almost surely, 2^138378554 is an apocalyptic number.

138378554 is a deficient number, since it is larger than the sum of its proper divisors (69239974).

138378554 is an equidigital number, since it uses as much as digits as its factorization.

138378554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16900.

The product of its digits is 403200, while the sum is 44.

The square root of 138378554 is about 11763.4414182245. The cubic root of 138378554 is about 517.2370141908.

The spelling of 138378554 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, five hundred fifty-four".