138306798 has 64 divisors (see below), whose sum is σ = 371934720. Its totient is φ = 37190016.

The previous prime is 138306761. The next prime is 138306799. The reversal of 138306798 is 897603831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138306799) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4336 + ... + 17187.

It is an arithmetic number, because the mean of its divisors is an integer number (5811480).

Almost surely, 2^138306798 is an apocalyptic number.

138306798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138306798 is an abundant number, since it is smaller than the sum of its proper divisors (233627922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138306798 is a wasteful number, since it uses less digits than its factorization.

138306798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21558 (or 21552 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 138306798 is about 11760.3910649264. The cubic root of 138306798 is about 517.1475945631.

It can be divided in two parts, 138 and 306798, that added together give a triangular number (306936 = T₇₈₃).

The spelling of 138306798 in words is "one hundred thirty-eight million, three hundred six thousand, seven hundred ninety-eight".