138647436 has 24 divisors (see below), whose sum is σ = 332255280. Its totient is φ = 44966592.

The previous prime is 138647401. The next prime is 138647441. The reversal of 138647436 is 634746831.

It is a happy number.

It is a super-2 number, since 2×138647436² = 38446223018748192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155691 + ... + 156578.

It is an arithmetic number, because the mean of its divisors is an integer number (13843970).

Almost surely, 2^138647436 is an apocalyptic number.

It is an amenable number.

138647436 is an abundant number, since it is smaller than the sum of its proper divisors (193607844).

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

138647436 is a wasteful number, since it uses less digits than its factorization.

138647436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312313 (or 312311 counting only the distinct ones).

The product of its digits is 290304, while the sum is 42.

The square root of 138647436 is about 11774.8645852086. The cubic root of 138647436 is about 517.5718101474.

The spelling of 138647436 in words is "one hundred thirty-eight million, six hundred forty-seven thousand, four hundred thirty-six".