65398123 has 4 divisors (see below), whose sum is σ = 74740720. Its totient is φ = 56055528.

The previous prime is 65398121. The next prime is 65398139. The reversal of 65398123 is 32189356.

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

It is a cyclic number.

It is not a de Polignac number, because 65398123 - 2¹ = 65398121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65398121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4671288 + ... + 4671301.

It is an arithmetic number, because the mean of its divisors is an integer number (18685180).

Almost surely, 2^65398123 is an apocalyptic number.

65398123 is a deficient number, since it is larger than the sum of its proper divisors (9342597).

65398123 is an equidigital number, since it uses as much as digits as its factorization.

65398123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9342596.

The product of its digits is 38880, while the sum is 37.

The square root of 65398123 is about 8086.9105967607. The cubic root of 65398123 is about 402.8917996070.

The spelling of 65398123 in words is "sixty-five million, three hundred ninety-eight thousand, one hundred twenty-three".