42440406806394 has 24 divisors (see below), whose sum is σ = 91954365988212. Its totient is φ = 14146779000960.

The previous prime is 42440406806393. The next prime is 42440406806419. The reversal of 42440406806394 is 49360860404424.

It is a happy number.

42440406806394 is a `hidden beast` number, since 4 + 244 + 0 + 4 + 0 + 6 + 8 + 0 + 6 + 394 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 42335778494025 + 104628312369 = 6506595^2 + 323463^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42440406806394.

It is not an unprimeable number, because it can be changed into a prime (42440406806393) 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, 12028162 + ... + 15151154.

Almost surely, 2^{42440406806394} is an apocalyptic number.

42440406806394 is an abundant number, since it is smaller than the sum of its proper divisors (49513959181818).

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

42440406806394 is a wasteful number, since it uses less digits than its factorization.

42440406806394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877982 (or 3877979 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 54.

The spelling of 42440406806394 in words is "forty-two trillion, four hundred forty billion, four hundred six million, eight hundred six thousand, three hundred ninety-four".