412887821 has 4 divisors (see below), whose sum is σ = 417527100. Its totient is φ = 408248544.

The previous prime is 412887793. The next prime is 412887829. The reversal of 412887821 is 128788214.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128788214 = 2 ⋅64394107.

It can be written as a sum of positive squares in 2 ways, for example, as 99102025 + 313785796 = 9955^2 + 17714^2 .

It is a cyclic number.

It is not a de Polignac number, because 412887821 - 2²² = 408693517 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 (412887829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2319506 + ... + 2319683.

It is an arithmetic number, because the mean of its divisors is an integer number (104381775).

Almost surely, 2^412887821 is an apocalyptic number.

It is an amenable number.

412887821 is a deficient number, since it is larger than the sum of its proper divisors (4639279).

412887821 is an equidigital number, since it uses as much as digits as its factorization.

412887821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639278.

The product of its digits is 57344, while the sum is 41.

The square root of 412887821 is about 20319.6412615971. The cubic root of 412887821 is about 744.6359923170.

The spelling of 412887821 in words is "four hundred twelve million, eight hundred eighty-seven thousand, eight hundred twenty-one".