138552437 has 4 divisors (see below), whose sum is σ = 144576480. Its totient is φ = 132528396.

The previous prime is 138552433. The next prime is 138552439. The reversal of 138552437 is 734255831.

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 138552437 - 2² = 138552433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138552437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138552433) 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, 3011987 + ... + 3012032.

It is an arithmetic number, because the mean of its divisors is an integer number (36144120).

Almost surely, 2^138552437 is an apocalyptic number.

It is an amenable number.

138552437 is a deficient number, since it is larger than the sum of its proper divisors (6024043).

138552437 is an equidigital number, since it uses as much as digits as its factorization.

138552437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6024042.

The product of its digits is 100800, while the sum is 38.

The square root of 138552437 is about 11770.8299197635. The cubic root of 138552437 is about 517.4535725033.

The spelling of 138552437 in words is "one hundred thirty-eight million, five hundred fifty-two thousand, four hundred thirty-seven".