646422841 has 16 divisors (see below), whose sum is σ = 699983424. Its totient is φ = 594745344.

The previous prime is 646422839. The next prime is 646422853. The reversal of 646422841 is 148224646.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 646422841 - 2¹ = 646422839 is a prime.

It is a super-2 number, since 2×646422841² = 835724978733022562, which contains 22 as substring.

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 646422841.

It is not an unprimeable number, because it can be changed into a prime (646422241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134506 + ... + 139228.

It is an arithmetic number, because the mean of its divisors is an integer number (43748964).

Almost surely, 2^646422841 is an apocalyptic number.

It is an amenable number.

646422841 is a deficient number, since it is larger than the sum of its proper divisors (53560583).

646422841 is a wasteful number, since it uses less digits than its factorization.

646422841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4920.

The product of its digits is 73728, while the sum is 37.

The square root of 646422841 is about 25424.8469218597. The cubic root of 646422841 is about 864.6471172434.

The spelling of 646422841 in words is "six hundred forty-six million, four hundred twenty-two thousand, eight hundred forty-one".