138212036 has 24 divisors (see below), whose sum is σ = 245270424. Its totient is φ = 68140800.

The previous prime is 138212033. The next prime is 138212047. The reversal of 138212036 is 630212831.

It can be written as a sum of positive squares in 4 ways, for example, as 52649536 + 85562500 = 7256^2 + 9250^2 .

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 138211996 and 138212014.

It is not an unprimeable number, because it can be changed into a prime (138212033) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 125906 + ... + 126998.

It is an arithmetic number, because the mean of its divisors is an integer number (10219601).

Almost surely, 2^138212036 is an apocalyptic number.

It is an amenable number.

138212036 is a deficient number, since it is larger than the sum of its proper divisors (107058388).

138212036 is a wasteful number, since it uses less digits than its factorization.

138212036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 1509 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 138212036 is about 11756.3615119645. The cubic root of 138212036 is about 517.0294583192.

Adding to 138212036 its reverse (630212831), we get a palindrome (768424867).

The spelling of 138212036 in words is "one hundred thirty-eight million, two hundred twelve thousand, thirty-six".