416672821 has 4 divisors (see below), whose sum is σ = 416784172. Its totient is φ = 416561472.

The previous prime is 416672777. The next prime is 416672843. The reversal of 416672821 is 128276614.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81270225 + 335402596 = 9015^2 + 18314^2 .

It is a cyclic number.

It is not a de Polignac number, because 416672821 - 2¹⁹ = 416148533 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 (416672621) 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, 49860 + ... + 57613.

It is an arithmetic number, because the mean of its divisors is an integer number (104196043).

Almost surely, 2^416672821 is an apocalyptic number.

It is an amenable number.

416672821 is a deficient number, since it is larger than the sum of its proper divisors (111351).

416672821 is a wasteful number, since it uses less digits than its factorization.

416672821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111350.

The product of its digits is 32256, while the sum is 37.

The square root of 416672821 is about 20412.5652724002. The cubic root of 416672821 is about 746.9044684159.

The spelling of 416672821 in words is "four hundred sixteen million, six hundred seventy-two thousand, eight hundred twenty-one".