65139242 has 32 divisors (see below), whose sum is σ = 115081344. Its totient is φ = 27072000.

The previous prime is 65139241. The next prime is 65139247. The reversal of 65139242 is 24293156.

It is a happy number.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 65139199 and 65139208.

It is not an unprimeable number, because it can be changed into a prime (65139241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162242 + ... + 162642.

It is an arithmetic number, because the mean of its divisors is an integer number (3596292).

Almost surely, 2^65139242 is an apocalyptic number.

65139242 is a deficient number, since it is larger than the sum of its proper divisors (49942102).

65139242 is a wasteful number, since it uses less digits than its factorization.

65139242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734.

The product of its digits is 12960, while the sum is 32.

The square root of 65139242 is about 8070.8885508350. Note that the first 3 decimals coincide. The cubic root of 65139242 is about 402.3594756543.

It can be divided in two parts, 651 and 39242, that added together give a palindrome (39893).

The spelling of 65139242 in words is "sixty-five million, one hundred thirty-nine thousand, two hundred forty-two".