138437 has 8 divisors (see below), whose sum is σ = 155904. Its totient is φ = 121968.

The previous prime is 138433. The next prime is 138449. The reversal of 138437 is 734831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138437 - 2² = 138433 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 (138433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68 + ... + 530.

It is an arithmetic number, because the mean of its divisors is an integer number (19488).

2¹³⁸⁴³⁷ is an apocalyptic number.

It is an amenable number.

138437 is a deficient number, since it is larger than the sum of its proper divisors (17467).

138437 is a wasteful number, since it uses less digits than its factorization.

138437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499.

The product of its digits is 2016, while the sum is 26.

The square root of 138437 is about 372.0712297397. The cubic root of 138437 is about 51.7309824557.

It can be divided in two parts, 138 and 437, that multiplied together give a palindrome (60306).

The spelling of 138437 in words is "one hundred thirty-eight thousand, four hundred thirty-seven".