138544899 has 4 divisors (see below), whose sum is σ = 184726536. Its totient is φ = 92363264.

The previous prime is 138544897. The next prime is 138544933. The reversal of 138544899 is 998445831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138544899 - 2¹ = 138544897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138544897) 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, 23090814 + ... + 23090819.

It is an arithmetic number, because the mean of its divisors is an integer number (46181634).

Almost surely, 2^138544899 is an apocalyptic number.

138544899 is a deficient number, since it is larger than the sum of its proper divisors (46181637).

138544899 is an equidigital number, since it uses as much as digits as its factorization.

138544899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46181636.

The product of its digits is 1244160, while the sum is 51.

The square root of 138544899 is about 11770.5097170853. The cubic root of 138544899 is about 517.4441882446. Note that the first 3 decimals are identical.

The spelling of 138544899 in words is "one hundred thirty-eight million, five hundred forty-four thousand, eight hundred ninety-nine".