138101812 has 12 divisors (see below), whose sum is σ = 255894660. Its totient is φ = 64989056.

The previous prime is 138101809. The next prime is 138101813. The reversal of 138101812 is 218101831.

It can be written as a sum of positive squares in 2 ways, for example, as 115004176 + 23097636 = 10724^2 + 4806^2 .

It is a super-2 number, since 2×138101812² = 38144220955366688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138101813) 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 3 ways as a sum of consecutive naturals, for example, 1015387 + ... + 1015522.

It is an arithmetic number, because the mean of its divisors is an integer number (21324555).

Almost surely, 2^138101812 is an apocalyptic number.

It is an amenable number.

138101812 is a deficient number, since it is larger than the sum of its proper divisors (117792848).

138101812 is a wasteful number, since it uses less digits than its factorization.

138101812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030930 (or 2030928 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 138101812 is about 11751.6727319986. The cubic root of 138101812 is about 516.8919782247.

The spelling of 138101812 in words is "one hundred thirty-eight million, one hundred one thousand, eight hundred twelve".