138248306 has 12 divisors (see below), whose sum is σ = 241229358. Its totient is φ = 59249232.

The previous prime is 138248303. The next prime is 138248321. The reversal of 138248306 is 603842831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 134212225 + 4036081 = 11585^2 + 2009^2 .

It is a super-2 number, since 2×138248306² = 38225188223739272, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138248303) 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 in 5 ways as a sum of consecutive naturals, for example, 705251 + ... + 705446.

Almost surely, 2^138248306 is an apocalyptic number.

138248306 is a deficient number, since it is larger than the sum of its proper divisors (102981052).

138248306 is a wasteful number, since it uses less digits than its factorization.

138248306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410713 (or 1410706 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 138248306 is about 11757.9039798767. The cubic root of 138248306 is about 517.0746811494.

The spelling of 138248306 in words is "one hundred thirty-eight million, two hundred forty-eight thousand, three hundred six".