138420111 has 16 divisors (see below), whose sum is σ = 194983040. Its totient is φ = 87104160.

The previous prime is 138420101. The next prime is 138420133. The reversal of 138420111 is 111024831.

It is a happy number.

It is not a de Polignac number, because 138420111 - 2²⁵ = 104865679 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 (138420101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11841 + ... + 20421.

It is an arithmetic number, because the mean of its divisors is an integer number (12186440).

Almost surely, 2^138420111 is an apocalyptic number.

138420111 is a deficient number, since it is larger than the sum of its proper divisors (56562929).

138420111 is a wasteful number, since it uses less digits than its factorization.

138420111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8886.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 138420111 is about 11765.2076479763. The cubic root of 138420111 is about 517.2887868261.

Adding to 138420111 its reverse (111024831), we get a palindrome (249444942).

The spelling of 138420111 in words is "one hundred thirty-eight million, four hundred twenty thousand, one hundred eleven".