818405442 has 24 divisors (see below), whose sum is σ = 1821137916. Its totient is φ = 265428576.

The previous prime is 818405429. The next prime is 818405447. The reversal of 818405442 is 244504818.

It can be written as a sum of positive squares in 2 ways, for example, as 717221961 + 101183481 = 26781^2 + 10059^2 .

It is a junction number, because it is equal to n+sod(n) for n = 818405397 and 818405406.

It is not an unprimeable number, because it can be changed into a prime (818405447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 613753 + ... + 615084.

Almost surely, 2^818405442 is an apocalyptic number.

818405442 is an abundant number, since it is smaller than the sum of its proper divisors (1002732474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

818405442 is a wasteful number, since it uses less digits than its factorization.

818405442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228882 (or 1228879 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 36.

The square root of 818405442 is about 28607.7863876253. The cubic root of 818405442 is about 935.3830651305.

The spelling of 818405442 in words is "eight hundred eighteen million, four hundred five thousand, four hundred forty-two".