138342236 has 12 divisors (see below), whose sum is σ = 242403840. Its totient is φ = 69084000.

The previous prime is 138342233. The next prime is 138342247. The reversal of 138342236 is 632243831.

It is a super-2 number, since 2×138342236² = 38277148522959392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138342233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18140 + ... + 24611.

It is an arithmetic number, because the mean of its divisors is an integer number (20200320).

Almost surely, 2^138342236 is an apocalyptic number.

It is an amenable number.

138342236 is a deficient number, since it is larger than the sum of its proper divisors (104061604).

138342236 is a wasteful number, since it uses less digits than its factorization.

138342236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43564 (or 43562 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 138342236 is about 11761.8976360110. The cubic root of 138342236 is about 517.1917599300.

The spelling of 138342236 in words is "one hundred thirty-eight million, three hundred forty-two thousand, two hundred thirty-six".