138740 has 24 divisors (see below), whose sum is σ = 333312. Its totient is φ = 47520.

The previous prime is 138739. The next prime is 138763. The reversal of 138740 is 47831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356 + ... + 635.

It is an arithmetic number, because the mean of its divisors is an integer number (13888).

2¹³⁸⁷⁴⁰ is an apocalyptic number.

138740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138740 is an abundant number, since it is smaller than the sum of its proper divisors (194572).

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

138740 is a wasteful number, since it uses less digits than its factorization.

138740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007 (or 1005 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 138740 is about 372.4781872808. The cubic root of 138740 is about 51.7686965203.

Subtracting from 138740 its reverse (47831), we obtain a palindrome (90909).

It can be divided in two parts, 138 and 740, that added together give a palindrome (878).

The spelling of 138740 in words is "one hundred thirty-eight thousand, seven hundred forty".