405634539849 has 24 divisors (see below), whose sum is σ = 679409922240. Its totient is φ = 210719240160.

The previous prime is 405634539823. The next prime is 405634539881. The reversal of 405634539849 is 948935436504.

It is not a de Polignac number, because 405634539849 - 2²³ = 405626151241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405634539792 and 405634539801.

It is not an unprimeable number, because it can be changed into a prime (405634539049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79815354 + ... + 79820435.

It is an arithmetic number, because the mean of its divisors is an integer number (28308746760).

Almost surely, 2^405634539849 is an apocalyptic number.

It is an amenable number.

405634539849 is a deficient number, since it is larger than the sum of its proper divisors (273775382391).

405634539849 is a wasteful number, since it uses less digits than its factorization.

405634539849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159635821 (or 159635810 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 60.

The spelling of 405634539849 in words is "four hundred five billion, six hundred thirty-four million, five hundred thirty-nine thousand, eight hundred forty-nine".