138898747 has 4 divisors (see below), whose sum is σ = 149583280. Its totient is φ = 128214216.

The previous prime is 138898741. The next prime is 138898783. The reversal of 138898747 is 747898831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 747898831 = 1217 ⋅614543.

It is not a de Polignac number, because 138898747 - 2¹⁹ = 138374459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138898741) 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, 5342247 + ... + 5342272.

It is an arithmetic number, because the mean of its divisors is an integer number (37395820).

Almost surely, 2^138898747 is an apocalyptic number.

138898747 is a deficient number, since it is larger than the sum of its proper divisors (10684533).

138898747 is a wasteful number, since it uses less digits than its factorization.

138898747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10684532.

The product of its digits is 2709504, while the sum is 55.

The square root of 138898747 is about 11785.5312565875. The cubic root of 138898747 is about 517.8843366131.

The spelling of 138898747 in words is "one hundred thirty-eight million, eight hundred ninety-eight thousand, seven hundred forty-seven".