138156543 has 64 divisors (see below), whose sum is σ = 249856000. Its totient is φ = 73693152.

The previous prime is 138156527. The next prime is 138156559. The reversal of 138156543 is 345651831.

138156543 is a `hidden beast` number, since 13 + 81 + 565 + 4 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (138156527) and next prime (138156559).

It is not a de Polignac number, because 138156543 - 2⁴ = 138156527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138156498 and 138156507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138156503) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 283446 + ... + 283932.

It is an arithmetic number, because the mean of its divisors is an integer number (3904000).

Almost surely, 2^138156543 is an apocalyptic number.

138156543 is a deficient number, since it is larger than the sum of its proper divisors (111699457).

138156543 is a wasteful number, since it uses less digits than its factorization.

138156543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 595 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 138156543 is about 11754.0011485451. The cubic root of 138156543 is about 516.9602521985.

The spelling of 138156543 in words is "one hundred thirty-eight million, one hundred fifty-six thousand, five hundred forty-three".