405409331 has 4 divisors (see below), whose sum is σ = 405732600. Its totient is φ = 405086064.

The previous prime is 405409321. The next prime is 405409373. The reversal of 405409331 is 133904504.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 405409331 - 2¹⁸ = 405147187 is a prime.

It is a super-2 number, since 2×405409331² = 328713451323735122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405409294 and 405409303.

It is not an unprimeable number, because it can be changed into a prime (405409321) 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, 159746 + ... + 162263.

It is an arithmetic number, because the mean of its divisors is an integer number (101433150).

Almost surely, 2^405409331 is an apocalyptic number.

405409331 is a deficient number, since it is larger than the sum of its proper divisors (323269).

405409331 is a wasteful number, since it uses less digits than its factorization.

405409331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323268.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 405409331 is about 20134.7791395883. The cubic root of 405409331 is about 740.1127969036.

The spelling of 405409331 in words is "four hundred five million, four hundred nine thousand, three hundred thirty-one".