646411421 has 8 divisors (see below), whose sum is σ = 669081600. Its totient is φ = 623766640.

The previous prime is 646411393. The next prime is 646411433. The reversal of 646411421 is 124114646.

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 646411421 - 2⁶ = 646411357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646411471) 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, 55940 + ... + 66498.

It is an arithmetic number, because the mean of its divisors is an integer number (83635200).

Almost surely, 2^646411421 is an apocalyptic number.

It is an amenable number.

646411421 is a deficient number, since it is larger than the sum of its proper divisors (22670179).

646411421 is a wasteful number, since it uses less digits than its factorization.

646411421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12699.

The product of its digits is 4608, while the sum is 29.

The square root of 646411421 is about 25424.6223374114. The cubic root of 646411421 is about 864.6420254636.

The spelling of 646411421 in words is "six hundred forty-six million, four hundred eleven thousand, four hundred twenty-one".