138897 has 24 divisors (see below), whose sum is σ = 232128. Its totient is φ = 79200.

The previous prime is 138893. The next prime is 138899. The reversal of 138897 is 798831.

It is not a de Polignac number, because 138897 - 2² = 138893 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 2247 + ... + 2307.

It is an arithmetic number, because the mean of its divisors is an integer number (9672).

2¹³⁸⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

138897 is a deficient number, since it is larger than the sum of its proper divisors (93231).

138897 is a wasteful number, since it uses less digits than its factorization.

138897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 98 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 138897 is about 372.6888782886. The cubic root of 138897 is about 51.7882165373.

It can be divided in two parts, 1388 and 97, that added together give a triangular number (1485 = T₅₄).

The spelling of 138897 in words is "one hundred thirty-eight thousand, eight hundred ninety-seven".