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138786229 = 887156467

138786229 has 4 divisors (see below), whose sum is σ = 138943584. Its totient is φ = 138628876.

The previous prime is 138786191. The next prime is 138786233. The reversal of 138786229 is 922687831.

It can be divided in two parts, 1387 and 86229, that added together give a square (87616 = 2962).

138786229 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 138786229 - 223 = 130397621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138786239) 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, 77347 + ... + 79120.

It is an arithmetic number, because the mean of its divisors is an integer number (34735896).

It is a 882-hyperperfect number.

Almost surely, 2138786229 is an apocalyptic number.

It is an amenable number.

138786229 is a deficient number, since it is larger than the sum of its proper divisors (157355).

138786229 is an equidigital number, since it uses as much as digits as its factorization.

138786229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157354.

The product of its digits is 290304, while the sum is 46.

The square root of 138786229 is about 11780.7567244214. The cubic root of 138786229 is about 517.7444576178.

The spelling of 138786229 in words is "one hundred thirty-eight million, seven hundred eighty-six thousand, two hundred twenty-nine".

Divisors: 1 887 156467 138786229