138958 has 16 divisors (see below), whose sum is σ = 227664. Its totient is φ = 63360.

The previous prime is 138937. The next prime is 138959. The reversal of 138958 is 859831.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2041 + ... + 2107.

It is an arithmetic number, because the mean of its divisors is an integer number (14229).

2¹³⁸⁹⁵⁸ is an apocalyptic number.

138958 is a deficient number, since it is larger than the sum of its proper divisors (88706).

138958 is a wasteful number, since it uses less digits than its factorization.

138958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147.

The product of its digits is 8640, while the sum is 34.

The square root of 138958 is about 372.7707070036. The cubic root of 138958 is about 51.7957967798.

The spelling of 138958 in words is "one hundred thirty-eight thousand, nine hundred fifty-eight".