408025821 has 16 divisors (see below), whose sum is σ = 622301184. Its totient is φ = 232952304.

The previous prime is 408025811. The next prime is 408025837. The reversal of 408025821 is 128520804.

It is not a de Polignac number, because 408025821 - 2¹⁷ = 407894749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408025811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17740 + ... + 33626.

It is an arithmetic number, because the mean of its divisors is an integer number (38893824).

Almost surely, 2^408025821 is an apocalyptic number.

It is an amenable number.

408025821 is a deficient number, since it is larger than the sum of its proper divisors (214275363).

408025821 is a wasteful number, since it uses less digits than its factorization.

408025821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17120.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 408025821 is about 20199.6490316045. The cubic root of 408025821 is about 741.7015998247.

The spelling of 408025821 in words is "four hundred eight million, twenty-five thousand, eight hundred twenty-one".