138916 has 6 divisors (see below), whose sum is σ = 243110. Its totient is φ = 69456.

The previous prime is 138899. The next prime is 138917. The reversal of 138916 is 619831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 78400 + 60516 = 280^2 + 246^2 .

It is not an unprimeable number, because it can be changed into a prime (138917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17361 + ... + 17368.

2¹³⁸⁹¹⁶ is an apocalyptic number.

It is an amenable number.

138916 is a deficient number, since it is larger than the sum of its proper divisors (104194).

138916 is a wasteful number, since it uses less digits than its factorization.

138916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34733 (or 34731 counting only the distinct ones).

The product of its digits is 1296, while the sum is 28.

The square root of 138916 is about 372.7143678476. The cubic root of 138916 is about 51.7905778344.

The spelling of 138916 in words is "one hundred thirty-eight thousand, nine hundred sixteen".