405899811 has 12 divisors (see below), whose sum is σ = 597362688. Its totient is φ = 265493904.

The previous prime is 405899807. The next prime is 405899821. The reversal of 405899811 is 118998504.

It is not a de Polignac number, because 405899811 - 2² = 405899807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405899801) 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 11 ways as a sum of consecutive naturals, for example, 424995 + ... + 425948.

It is an arithmetic number, because the mean of its divisors is an integer number (49780224).

Almost surely, 2^405899811 is an apocalyptic number.

405899811 is a deficient number, since it is larger than the sum of its proper divisors (191462877).

405899811 is a wasteful number, since it uses less digits than its factorization.

405899811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851002 (or 850999 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 405899811 is about 20146.9553779225. The cubic root of 405899811 is about 740.4111490467.

The spelling of 405899811 in words is "four hundred five million, eight hundred ninety-nine thousand, eight hundred eleven".