65140039 has 4 divisors (see below), whose sum is σ = 68971824. Its totient is φ = 61308256.

The previous prime is 65140027. The next prime is 65140057. The reversal of 65140039 is 93004156.

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

It is not a de Polignac number, because 65140039 - 2⁵ = 65140007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65139989 and 65140016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65140099) 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, 1915867 + ... + 1915900.

It is an arithmetic number, because the mean of its divisors is an integer number (17242956).

Almost surely, 2^65140039 is an apocalyptic number.

65140039 is a deficient number, since it is larger than the sum of its proper divisors (3831785).

65140039 is a wasteful number, since it uses less digits than its factorization.

65140039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831784.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 65140039 is about 8070.9379256689. The cubic root of 65140039 is about 402.3611166477.

The spelling of 65140039 in words is "sixty-five million, one hundred forty thousand, thirty-nine".