138542437 has 4 divisors (see below), whose sum is σ = 151137216. Its totient is φ = 125947660.

The previous prime is 138542429. The next prime is 138542507. The reversal of 138542437 is 734245831.

It is a happy number.

138542437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138542437 - 2³ = 138542429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138542396 and 138542405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138542237) 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, 6297373 + ... + 6297394.

It is an arithmetic number, because the mean of its divisors is an integer number (37784304).

Almost surely, 2^138542437 is an apocalyptic number.

It is an amenable number.

138542437 is a deficient number, since it is larger than the sum of its proper divisors (12594779).

138542437 is a wasteful number, since it uses less digits than its factorization.

138542437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12594778.

The product of its digits is 80640, while the sum is 37.

The square root of 138542437 is about 11770.4051332144. The cubic root of 138542437 is about 517.4411231609.

The spelling of 138542437 in words is "one hundred thirty-eight million, five hundred forty-two thousand, four hundred thirty-seven".