405811381 has 8 divisors (see below), whose sum is σ = 413238240. Its totient is φ = 398402928.

The previous prime is 405811361. The next prime is 405811391. The reversal of 405811381 is 183118504.

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

It is not a de Polignac number, because 405811381 - 2⁵ = 405811349 is a prime.

It is a super-2 number, since 2×405811381² = 329365753898254322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405811321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44635 + ... + 52951.

It is an arithmetic number, because the mean of its divisors is an integer number (51654780).

Almost surely, 2^405811381 is an apocalyptic number.

It is an amenable number.

405811381 is a deficient number, since it is larger than the sum of its proper divisors (7426859).

405811381 is an equidigital number, since it uses as much as digits as its factorization.

405811381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9203.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 405811381 is about 20144.7606339713. The cubic root of 405811381 is about 740.3573760781.

Adding to 405811381 its reverse (183118504), we get a palindrome (588929885).

The spelling of 405811381 in words is "four hundred five million, eight hundred eleven thousand, three hundred eighty-one".