138994 has 4 divisors (see below), whose sum is σ = 208494. Its totient is φ = 69496.

The previous prime is 138977. The next prime is 139021. The reversal of 138994 is 499831.

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., 131769 + 7225 = 363^2 + 85^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34747 + ... + 34750.

2¹³⁸⁹⁹⁴ is an apocalyptic number.

138994 is a deficient number, since it is larger than the sum of its proper divisors (69500).

138994 is an equidigital number, since it uses as much as digits as its factorization.

138994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69499.

The product of its digits is 7776, while the sum is 34.

The square root of 138994 is about 372.8189909326. The cubic root of 138994 is about 51.8002693247.

The spelling of 138994 in words is "one hundred thirty-eight thousand, nine hundred ninety-four".