138898911 has 8 divisors (see below), whose sum is σ = 194945920. Its totient is φ = 87725592.

The previous prime is 138898889. The next prime is 138898927. The reversal of 138898911 is 119898831.

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

It is not a de Polignac number, because 138898911 - 2⁶ = 138898847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138898411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1218355 + ... + 1218468.

It is an arithmetic number, because the mean of its divisors is an integer number (24368240).

Almost surely, 2^138898911 is an apocalyptic number.

138898911 is a deficient number, since it is larger than the sum of its proper divisors (56047009).

138898911 is a wasteful number, since it uses less digits than its factorization.

138898911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436845.

The product of its digits is 124416, while the sum is 48.

The square root of 138898911 is about 11785.5382142692. The cubic root of 138898911 is about 517.8845404378.

The spelling of 138898911 in words is "one hundred thirty-eight million, eight hundred ninety-eight thousand, nine hundred eleven".