65943421 has 4 divisors (see below), whose sum is σ = 66312000. Its totient is φ = 65574844.

The previous prime is 65943401. The next prime is 65943469. The reversal of 65943421 is 12434956.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65943421 - 2¹³ = 65935229 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 (65943401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184021 + ... + 184378.

It is an arithmetic number, because the mean of its divisors is an integer number (16578000).

Almost surely, 2^65943421 is an apocalyptic number.

It is an amenable number.

65943421 is a deficient number, since it is larger than the sum of its proper divisors (368579).

65943421 is a wasteful number, since it uses less digits than its factorization.

65943421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368578.

The product of its digits is 25920, while the sum is 34.

The square root of 65943421 is about 8120.5554612970. Note that the first 3 decimals coincide. The cubic root of 65943421 is about 404.0084895938.

The spelling of 65943421 in words is "sixty-five million, nine hundred forty-three thousand, four hundred twenty-one".