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138231293 = 1091268177
BaseRepresentation
bin10000011110100…
…11110111111101
3100122002212200112
420033103313331
5240341400133
621414435405
73265642454
oct1017236775
9318085615
10138231293
1171034242
123a362b65
132283b285
1414503b9b
15c207648
hex83d3dfd

138231293 has 4 divisors (see below), whose sum is σ = 139499580. Its totient is φ = 136963008.

The previous prime is 138231239. The next prime is 138231319. The reversal of 138231293 is 392132831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111471364 + 26759929 = 10558^2 + 5173^2 .

It is a cyclic number.

It is not a de Polignac number, because 138231293 - 26 = 138231229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138201293) 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, 633980 + ... + 634197.

It is an arithmetic number, because the mean of its divisors is an integer number (34874895).

Almost surely, 2138231293 is an apocalyptic number.

It is an amenable number.

138231293 is a deficient number, since it is larger than the sum of its proper divisors (1268287).

138231293 is a wasteful number, since it uses less digits than its factorization.

138231293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268286.

The product of its digits is 7776, while the sum is 32.

The square root of 138231293 is about 11757.1804868344. The cubic root of 138231293 is about 517.0534696721.

The spelling of 138231293 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, two hundred ninety-three".

Divisors: 1 109 1268177 138231293