138798645 has 8 divisors (see below), whose sum is σ = 222077856. Its totient is φ = 74025936.

The previous prime is 138798643. The next prime is 138798677. The reversal of 138798645 is 546897831.

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

It is not a de Polignac number, because 138798645 - 2¹ = 138798643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138798643) 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, 4626607 + ... + 4626636.

It is an arithmetic number, because the mean of its divisors is an integer number (27759732).

Almost surely, 2^138798645 is an apocalyptic number.

138798645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138798645 is a deficient number, since it is larger than the sum of its proper divisors (83279211).

138798645 is an equidigital number, since it uses as much as digits as its factorization.

138798645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9253251.

The product of its digits is 1451520, while the sum is 51.

The square root of 138798645 is about 11781.2836736919. The cubic root of 138798645 is about 517.7598965259.

The spelling of 138798645 in words is "one hundred thirty-eight million, seven hundred ninety-eight thousand, six hundred forty-five".