138401144 has 16 divisors (see below), whose sum is σ = 296574000. Its totient is φ = 59314752.

The previous prime is 138401129. The next prime is 138401161. The reversal of 138401144 is 441104831.

138401144 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1235669 + ... + 1235780.

It is an arithmetic number, because the mean of its divisors is an integer number (18535875).

Almost surely, 2^138401144 is an apocalyptic number.

138401144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

138401144 is an abundant number, since it is smaller than the sum of its proper divisors (158172856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138401144 is a wasteful number, since it uses less digits than its factorization.

138401144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471462 (or 2471458 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 138401144 is about 11764.4015572404. The cubic root of 138401144 is about 517.2651586011.

Adding to 138401144 its reverse (441104831), we get a palindrome (579505975).

The spelling of 138401144 in words is "one hundred thirty-eight million, four hundred one thousand, one hundred forty-four".