138569436 has 18 divisors (see below), whose sum is σ = 350272832. Its totient is φ = 46189800.

The previous prime is 138569429. The next prime is 138569441. The reversal of 138569436 is 634965831.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 138569391 and 138569400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1924540 + ... + 1924611.

Almost surely, 2^138569436 is an apocalyptic number.

It is an amenable number.

138569436 is an abundant number, since it is smaller than the sum of its proper divisors (211703396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138569436 is a wasteful number, since it uses less digits than its factorization.

138569436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3849161 (or 3849156 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 138569436 is about 11771.5519792422. The cubic root of 138569436 is about 517.4747337661.

The spelling of 138569436 in words is "one hundred thirty-eight million, five hundred sixty-nine thousand, four hundred thirty-six".