138849897 has 8 divisors (see below), whose sum is σ = 196023456. Its totient is φ = 87121472.

The previous prime is 138849889. The next prime is 138849901. The reversal of 138849897 is 798948831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138849897 - 2³ = 138849889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138849817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1361223 + ... + 1361324.

It is an arithmetic number, because the mean of its divisors is an integer number (24502932).

Almost surely, 2^138849897 is an apocalyptic number.

138849897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138849897 is a deficient number, since it is larger than the sum of its proper divisors (57173559).

138849897 is a wasteful number, since it uses less digits than its factorization.

138849897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722567.

The product of its digits is 3483648, while the sum is 57.

The square root of 138849897 is about 11783.4586179101. The cubic root of 138849897 is about 517.8236170439.

The spelling of 138849897 in words is "one hundred thirty-eight million, eight hundred forty-nine thousand, eight hundred ninety-seven".