138420544 has 14 divisors (see below), whose sum is σ = 274678394. Its totient is φ = 69210240.

The previous prime is 138420523. The next prime is 138420563. The reversal of 138420544 is 445024831.

It can be written as a sum of positive squares in only one way, i.e., 135489600 + 2930944 = 11640^2 + 1712^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1081347 + ... + 1081474.

Almost surely, 2^138420544 is an apocalyptic number.

It is an amenable number.

138420544 is a deficient number, since it is larger than the sum of its proper divisors (136257850).

138420544 is an equidigital number, since it uses as much as digits as its factorization.

138420544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162833 (or 2162823 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 138420544 is about 11765.2260496771. The cubic root of 138420544 is about 517.2893262126.

The spelling of 138420544 in words is "one hundred thirty-eight million, four hundred twenty thousand, five hundred forty-four".