405406481 has 8 divisors (see below), whose sum is σ = 416086560. Its totient is φ = 394862688.

The previous prime is 405406471. The next prime is 405406489. The reversal of 405406481 is 184604504.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 405406481 - 2¹⁰ = 405405457 is a prime.

It is a super-2 number, since 2×405406481² = 328708829673606722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405406489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28031 + ... + 39956.

It is an arithmetic number, because the mean of its divisors is an integer number (52010820).

Almost surely, 2^405406481 is an apocalyptic number.

It is an amenable number.

405406481 is a deficient number, since it is larger than the sum of its proper divisors (10680079).

405406481 is an equidigital number, since it uses as much as digits as its factorization.

405406481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68143.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 405406481 is about 20134.7083664005. The cubic root of 405406481 is about 740.1110625853. Note that the first 3 decimals are identical.

The spelling of 405406481 in words is "four hundred five million, four hundred six thousand, four hundred eighty-one".