138535536 has 40 divisors (see below), whose sum is σ = 376721920. Its totient is φ = 43747776.

The previous prime is 138535519. The next prime is 138535541. The reversal of 138535536 is 635535831.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 138535494 and 138535503.

It is a congruent number.

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, 75040 + ... + 76863.

It is an arithmetic number, because the mean of its divisors is an integer number (9418048).

Almost surely, 2^138535536 is an apocalyptic number.

138535536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138535536 is an abundant number, since it is smaller than the sum of its proper divisors (238186384).

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

138535536 is a wasteful number, since it uses less digits than its factorization.

138535536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151933 (or 151927 counting only the distinct ones).

The product of its digits is 162000, while the sum is 39.

The square root of 138535536 is about 11770.1119790765. Note that the first 3 decimals coincide. The cubic root of 138535536 is about 517.4325315202.

The spelling of 138535536 in words is "one hundred thirty-eight million, five hundred thirty-five thousand, five hundred thirty-six".