65040391 has 8 divisors (see below), whose sum is σ = 71752464. Its totient is φ = 58572480.

The previous prime is 65040379. The next prime is 65040499. The reversal of 65040391 is 19304056.

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 65040391 - 2¹⁹ = 64516103 is a prime.

It is a super-2 number, since 2×65040391² = 8460504922865762, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65040341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60481 + ... + 61546.

It is an arithmetic number, because the mean of its divisors is an integer number (8969058).

Almost surely, 2^65040391 is an apocalyptic number.

65040391 is a deficient number, since it is larger than the sum of its proper divisors (6712073).

65040391 is a wasteful number, since it uses less digits than its factorization.

65040391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122081.

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

The square root of 65040391 is about 8064.7623027588. The cubic root of 65040391 is about 402.1558412471.

It can be divided in two parts, 650 and 40391, that added together give a triangular number (41041 = T₂₈₆).

The spelling of 65040391 in words is "sixty-five million, forty thousand, three hundred ninety-one".