138898 has 8 divisors (see below), whose sum is σ = 214092.
Its totient is φ = 67536.
The previous prime is 138893. The next prime is 138899. The reversal of 138898 is 898831.
It can be divided in two parts, 13 and 8898, that added together give a triangular number (8911 = T133).
It can be written as a sum of positive squares in 2 ways, for example, as 127449 + 11449 = 357^2 + 107^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is a super-3 number, since 3×1388983 = 8039133334220376, which contains 333 as substring.
It is a Harshad number since it is a multiple of its sum of digits (37).
It is not an unprimeable number, because it can be changed into a prime (138893) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865 + ... + 1012.
2138898 is an apocalyptic number.
138898 is a deficient number, since it is larger than the sum of its proper divisors (75194).
138898 is a wasteful number, since it uses less digits than its factorization.
138898 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1916.
The product of its digits is 13824, while the sum is 37.
The square root of 138898 is about 372.6902198878.
The cubic root of 138898 is about 51.7883408214.
The spelling of 138898 in words is "one hundred thirty-eight thousand, eight hundred ninety-eight".