138090536 has 8 divisors (see below), whose sum is σ = 258919770. Its totient is φ = 69045264.

The previous prime is 138090521. The next prime is 138090569. The reversal of 138090536 is 635090831.

It can be written as a sum of positive squares in only one way, i.e., 120868036 + 17222500 = 10994^2 + 4150^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×138090536² = 38137992265534592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138090496 and 138090505.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8630651 + ... + 8630666.

Almost surely, 2^138090536 is an apocalyptic number.

It is an amenable number.

138090536 is a deficient number, since it is larger than the sum of its proper divisors (120829234).

138090536 is a wasteful number, since it uses less digits than its factorization.

138090536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17261323 (or 17261319 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 138090536 is about 11751.1929607168. The cubic root of 138090536 is about 516.8779097813.

The spelling of 138090536 in words is "one hundred thirty-eight million, ninety thousand, five hundred thirty-six".