405143823 has 16 divisors (see below), whose sum is σ = 620065280. Its totient is φ = 230497056.

The previous prime is 405143803. The next prime is 405143839. The reversal of 405143823 is 328341504.

It is not a de Polignac number, because 405143823 - 2⁸ = 405143567 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 (405143803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37315 + ... + 46932.

It is an arithmetic number, because the mean of its divisors is an integer number (38754080).

Almost surely, 2^405143823 is an apocalyptic number.

405143823 is a deficient number, since it is larger than the sum of its proper divisors (214921457).

405143823 is a wasteful number, since it uses less digits than its factorization.

405143823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84486.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 405143823 is about 20128.1847914808. The cubic root of 405143823 is about 739.9511916919.

It can be divided in two parts, 4051 and 43823, that added together give a palindrome (47874).

The spelling of 405143823 in words is "four hundred five million, one hundred forty-three thousand, eight hundred twenty-three".