65139739 has 8 divisors (see below), whose sum is σ = 74939648. Its totient is φ = 55463400.

The previous prime is 65139719. The next prime is 65139751. The reversal of 65139739 is 93793156.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65139739 - 2⁵ = 65139707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65139695 and 65139704.

It is not an unprimeable number, because it can be changed into a prime (65139719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29757 + ... + 31870.

It is an arithmetic number, because the mean of its divisors is an integer number (9367456).

Almost surely, 2^65139739 is an apocalyptic number.

65139739 is a deficient number, since it is larger than the sum of its proper divisors (9799909).

65139739 is a wasteful number, since it uses less digits than its factorization.

65139739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61785.

The product of its digits is 153090, while the sum is 43.

The square root of 65139739 is about 8070.9193404469. The cubic root of 65139739 is about 402.3604989604.

The spelling of 65139739 in words is "sixty-five million, one hundred thirty-nine thousand, seven hundred thirty-nine".