405621201 has 4 divisors (see below), whose sum is σ = 540828272. Its totient is φ = 270414132.

The previous prime is 405621199. The next prime is 405621211. The reversal of 405621201 is 102126504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 405621201 - 2¹ = 405621199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405621211) 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, 67603531 + ... + 67603536.

It is an arithmetic number, because the mean of its divisors is an integer number (135207068).

Almost surely, 2^405621201 is an apocalyptic number.

It is an amenable number.

405621201 is a deficient number, since it is larger than the sum of its proper divisors (135207071).

405621201 is a wasteful number, since it uses less digits than its factorization.

405621201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135207070.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 405621201 is about 20140.0397467334. The cubic root of 405621201 is about 740.2417039759.

Adding to 405621201 its reverse (102126504), we get a palindrome (507747705).

The spelling of 405621201 in words is "four hundred five million, six hundred twenty-one thousand, two hundred one".