138466 has 4 divisors (see below), whose sum is σ = 207702. Its totient is φ = 69232.

The previous prime is 138461. The next prime is 138469. The reversal of 138466 is 664831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 664831 = 733 ⋅907.

It can be written as a sum of positive squares in only one way, i.e., 73441 + 65025 = 271^2 + 255^2 .

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (138461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34615 + ... + 34618.

2¹³⁸⁴⁶⁶ is an apocalyptic number.

138466 is a deficient number, since it is larger than the sum of its proper divisors (69236).

138466 is an equidigital number, since it uses as much as digits as its factorization.

138466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69235.

The product of its digits is 3456, while the sum is 28.

The square root of 138466 is about 372.1101987315. The cubic root of 138466 is about 51.7345944326.

The spelling of 138466 in words is "one hundred thirty-eight thousand, four hundred sixty-six".