138547956 has 12 divisors (see below), whose sum is σ = 323278592. Its totient is φ = 46182648.

The previous prime is 138547951. The next prime is 138547957. The reversal of 138547956 is 659745831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×138547956² = 38391072223555872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138547951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5772820 + ... + 5772843.

Almost surely, 2^138547956 is an apocalyptic number.

It is an amenable number.

138547956 is an abundant number, since it is smaller than the sum of its proper divisors (184730636).

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

138547956 is a wasteful number, since it uses less digits than its factorization.

138547956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11545670 (or 11545668 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The square root of 138547956 is about 11770.6395748065. The cubic root of 138547956 is about 517.4479940270.

The spelling of 138547956 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, nine hundred fifty-six".