138730 has 8 divisors (see below), whose sum is σ = 249732. Its totient is φ = 55488.

The previous prime is 138727. The next prime is 138731. The reversal of 138730 is 37831.

138730 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 2 ways, for example, as 137641 + 1089 = 371^2 + 33^2 .

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (138731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6927 + ... + 6946.

2¹³⁸⁷³⁰ is an apocalyptic number.

138730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138730 is a deficient number, since it is larger than the sum of its proper divisors (111002).

138730 is a wasteful number, since it uses less digits than its factorization.

138730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13880.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 138730 is about 372.4647634341. The cubic root of 138730 is about 51.7674527083.

It can be divided in two parts, 138 and 730, that added together give a palindrome (868).

The spelling of 138730 in words is "one hundred thirty-eight thousand, seven hundred thirty".