65138423 has 16 divisors (see below), whose sum is σ = 76661760. Its totient is φ = 54194400.

The previous prime is 65138417. The next prime is 65138429. The reversal of 65138423 is 32483156.

It is an interprime number because it is at equal distance from previous prime (65138417) and next prime (65138429).

It is a cyclic number.

It is not a de Polignac number, because 65138423 - 2²⁴ = 48361207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65138423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65138429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32768 + ... + 34698.

It is an arithmetic number, because the mean of its divisors is an integer number (4791360).

Almost surely, 2^65138423 is an apocalyptic number.

65138423 is a deficient number, since it is larger than the sum of its proper divisors (11523337).

65138423 is a wasteful number, since it uses less digits than its factorization.

65138423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2078.

The product of its digits is 17280, while the sum is 32.

The square root of 65138423 is about 8070.8378127676. The cubic root of 65138423 is about 402.3577893498.

The spelling of 65138423 in words is "sixty-five million, one hundred thirty-eight thousand, four hundred twenty-three".