65406421 has 8 divisors (see below), whose sum is σ = 66467520. Its totient is φ = 64353408.

The previous prime is 65406401. The next prime is 65406427. The reversal of 65406421 is 12460456.

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 65406421 - 2⁵ = 65406389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65406421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65406427) 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, 15480 + ... + 19246.

It is an arithmetic number, because the mean of its divisors is an integer number (8308440).

Almost surely, 2^65406421 is an apocalyptic number.

It is an amenable number.

65406421 is a deficient number, since it is larger than the sum of its proper divisors (1061099).

65406421 is a wasteful number, since it uses less digits than its factorization.

65406421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 65406421 is about 8087.4236317878. The cubic root of 65406421 is about 402.9088391111.

Adding to 65406421 its reverse (12460456), we get a palindrome (77866877).

The spelling of 65406421 in words is "sixty-five million, four hundred six thousand, four hundred twenty-one".