405355421 has 4 divisors (see below), whose sum is σ = 405438144. Its totient is φ = 405272700.

The previous prime is 405355393. The next prime is 405355439. The reversal of 405355421 is 124553504.

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 a cyclic number.

It is not a de Polignac number, because 405355421 - 2¹⁴ = 405339037 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 (405355441) 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, 33515 + ... + 43976.

It is an arithmetic number, because the mean of its divisors is an integer number (101359536).

Almost surely, 2^405355421 is an apocalyptic number.

It is an amenable number.

405355421 is a deficient number, since it is larger than the sum of its proper divisors (82723).

405355421 is an equidigital number, since it uses as much as digits as its factorization.

405355421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82722.

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 405355421 is about 20133.4403667133. The cubic root of 405355421 is about 740.0799895272.

The spelling of 405355421 in words is "four hundred five million, three hundred fifty-five thousand, four hundred twenty-one".