138823898 has 4 divisors (see below), whose sum is σ = 208235850. Its totient is φ = 69411948.

The previous prime is 138823897. The next prime is 138823901. The reversal of 138823898 is 898328831.

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

It can be written as a sum of positive squares in only one way, i.e., 130256569 + 8567329 = 11413^2 + 2927^2 .

It is not an unprimeable number, because it can be changed into a prime (138823897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34705973 + ... + 34705976.

Almost surely, 2^138823898 is an apocalyptic number.

138823898 is a deficient number, since it is larger than the sum of its proper divisors (69411952).

138823898 is an equidigital number, since it uses as much as digits as its factorization.

138823898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69411951.

The product of its digits is 663552, while the sum is 50.

The square root of 138823898 is about 11782.3553672430. The cubic root of 138823898 is about 517.7912950019.

The spelling of 138823898 in words is "one hundred thirty-eight million, eight hundred twenty-three thousand, eight hundred ninety-eight".