138090812 has 6 divisors (see below), whose sum is σ = 241658928. Its totient is φ = 69045404.

The previous prime is 138090793. The next prime is 138090817. The reversal of 138090812 is 218090831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138090817) 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 as a sum of consecutive naturals, namely, 17261348 + ... + 17261355.

It is an arithmetic number, because the mean of its divisors is an integer number (40276488).

Almost surely, 2^138090812 is an apocalyptic number.

It is an amenable number.

138090812 is a deficient number, since it is larger than the sum of its proper divisors (103568116).

138090812 is a wasteful number, since it uses less digits than its factorization.

138090812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34522707 (or 34522705 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 138090812 is about 11751.2047041995. The cubic root of 138090812 is about 516.8782541404.

The spelling of 138090812 in words is "one hundred thirty-eight million, ninety thousand, eight hundred twelve".