138946 has 4 divisors (see below), whose sum is σ = 208422. Its totient is φ = 69472.

The previous prime is 138937. The next prime is 138959. The reversal of 138946 is 649831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 114921 + 24025 = 339^2 + 155^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34735 + ... + 34738.

2¹³⁸⁹⁴⁶ is an apocalyptic number.

138946 is a deficient number, since it is larger than the sum of its proper divisors (69476).

138946 is an equidigital number, since it uses as much as digits as its factorization.

138946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69475.

The product of its digits is 5184, while the sum is 31.

The square root of 138946 is about 372.7546109708. The cubic root of 138946 is about 51.7943057599.

The spelling of 138946 in words is "one hundred thirty-eight thousand, nine hundred forty-six".