842166405 has 12 divisors (see below), whose sum is σ = 1459755180. Its totient is φ = 449155392.

The previous prime is 842166397. The next prime is 842166433. The reversal of 842166405 is 504661248.

842166405 is a `hidden beast` number, since 8 + 4 + 2 + 1 + 6 + 640 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 384120801 + 458045604 = 19599^2 + 21402^2 .

It is not a de Polignac number, because 842166405 - 2³ = 842166397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 842166405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9357360 + ... + 9357449.

It is an arithmetic number, because the mean of its divisors is an integer number (121646265).

Almost surely, 2^842166405 is an apocalyptic number.

It is an amenable number.

842166405 is a deficient number, since it is larger than the sum of its proper divisors (617588775).

842166405 is a wasteful number, since it uses less digits than its factorization.

842166405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18714820 (or 18714817 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 842166405 is about 29020.1034629444. The cubic root of 842166405 is about 944.3492454319.

The spelling of 842166405 in words is "eight hundred forty-two million, one hundred sixty-six thousand, four hundred five".