138988 has 6 divisors (see below), whose sum is σ = 243236. Its totient is φ = 69492.

The previous prime is 138977. The next prime is 139021. The reversal of 138988 is 889831.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17370 + ... + 17377.

2¹³⁸⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

138988 is a deficient number, since it is larger than the sum of its proper divisors (104248).

138988 is a wasteful number, since it uses less digits than its factorization.

138988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34751 (or 34749 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 138988 is about 372.8109440454. The cubic root of 138988 is about 51.7995239542.

The spelling of 138988 in words is "one hundred thirty-eight thousand, nine hundred eighty-eight".