138420541 has 6 divisors (see below), whose sum is σ = 161019870. Its totient is φ = 118646136.

The previous prime is 138420523. The next prime is 138420563. The reversal of 138420541 is 145024831.

It can be written as a sum of positive squares in only one way, i.e., 84088900 + 54331641 = 9170^2 + 7371^2 .

It is not a de Polignac number, because 138420541 - 2¹³ = 138412349 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 (138420571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1412406 + ... + 1412503.

It is an arithmetic number, because the mean of its divisors is an integer number (26836645).

Almost surely, 2^138420541 is an apocalyptic number.

It is an amenable number.

138420541 is a deficient number, since it is larger than the sum of its proper divisors (22599329).

138420541 is an equidigital number, since it uses as much as digits as its factorization.

138420541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824923 (or 2824916 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 138420541 is about 11765.2259221827. The cubic root of 138420541 is about 517.2893224755.

The spelling of 138420541 in words is "one hundred thirty-eight million, four hundred twenty thousand, five hundred forty-one".