405852121 has 4 divisors (see below), whose sum is σ = 405959652. Its totient is φ = 405744592.

The previous prime is 405852107. The next prime is 405852127. The reversal of 405852121 is 121258504.

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 178596496 + 227255625 = 13364^2 + 15075^2 .

It is a cyclic number.

It is not a de Polignac number, because 405852121 - 2¹¹ = 405850073 is a prime.

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 405852121.

It is not an unprimeable number, because it can be changed into a prime (405852127) 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, 47890 + ... + 55723.

It is an arithmetic number, because the mean of its divisors is an integer number (101489913).

Almost surely, 2^405852121 is an apocalyptic number.

It is an amenable number.

405852121 is a deficient number, since it is larger than the sum of its proper divisors (107531).

405852121 is a wasteful number, since it uses less digits than its factorization.

405852121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107530.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 405852121 is about 20145.7717896337. The cubic root of 405852121 is about 740.3821504369.

The spelling of 405852121 in words is "four hundred five million, eight hundred fifty-two thousand, one hundred twenty-one".