138958798 has 8 divisors (see below), whose sum is σ = 227387160. Its totient is φ = 63163080.

The previous prime is 138958777. The next prime is 138958811. The reversal of 138958798 is 897859831.

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

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 3 ways as a sum of consecutive naturals, for example, 3158133 + ... + 3158176.

It is an arithmetic number, because the mean of its divisors is an integer number (28423395).

Almost surely, 2^138958798 is an apocalyptic number.

138958798 is a deficient number, since it is larger than the sum of its proper divisors (88428362).

138958798 is a wasteful number, since it uses less digits than its factorization.

138958798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316322.

The product of its digits is 4354560, while the sum is 58.

The square root of 138958798 is about 11788.0786390319. The cubic root of 138958798 is about 517.9589592962.

The spelling of 138958798 in words is "one hundred thirty-eight million, nine hundred fifty-eight thousand, seven hundred ninety-eight".