138534897 has 16 divisors (see below), whose sum is σ = 190494720. Its totient is φ = 89504592.

The previous prime is 138534883. The next prime is 138534899. The reversal of 138534897 is 798435831.

It is a de Polignac number, because none of the positive numbers 2^k-138534897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138534899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9754 + ... + 19292.

It is an arithmetic number, because the mean of its divisors is an integer number (11905920).

Almost surely, 2^138534897 is an apocalyptic number.

It is an amenable number.

138534897 is a deficient number, since it is larger than the sum of its proper divisors (51959823).

138534897 is a wasteful number, since it uses less digits than its factorization.

138534897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9692.

The product of its digits is 725760, while the sum is 48.

The square root of 138534897 is about 11770.0848340188. The cubic root of 138534897 is about 517.4317359605.

The spelling of 138534897 in words is "one hundred thirty-eight million, five hundred thirty-four thousand, eight hundred ninety-seven".