138998245 has 8 divisors (see below), whose sum is σ = 167059584. Its totient is φ = 111024144.

The previous prime is 138998227. The next prime is 138998261. The reversal of 138998245 is 542899831.

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 138998245 - 2¹¹ = 138996197 is a prime.

It is a super-2 number, since 2×138998245² = 38641024226160050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 18249 + ... + 24718.

It is an arithmetic number, because the mean of its divisors is an integer number (20882448).

Almost surely, 2^138998245 is an apocalyptic number.

It is an amenable number.

138998245 is a deficient number, since it is larger than the sum of its proper divisors (28061339).

138998245 is an equidigital number, since it uses as much as digits as its factorization.

138998245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43619.

The product of its digits is 622080, while the sum is 49.

The square root of 138998245 is about 11789.7516937381. The cubic root of 138998245 is about 518.0079666142.

The spelling of 138998245 in words is "one hundred thirty-eight million, nine hundred ninety-eight thousand, two hundred forty-five".