65406391 has 4 divisors (see below), whose sum is σ = 66234400. Its totient is φ = 64578384.

The previous prime is 65406389. The next prime is 65406401. The reversal of 65406391 is 19360456.

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 65406391 - 2¹ = 65406389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65406301) 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, 413886 + ... + 414043.

It is an arithmetic number, because the mean of its divisors is an integer number (16558600).

Almost surely, 2^65406391 is an apocalyptic number.

65406391 is a deficient number, since it is larger than the sum of its proper divisors (828009).

65406391 is an equidigital number, since it uses as much as digits as its factorization.

65406391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828008.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 65406391 is about 8087.4217770560. The cubic root of 65406391 is about 402.9087775103.

The spelling of 65406391 in words is "sixty-five million, four hundred six thousand, three hundred ninety-one".