40442218 has 16 divisors (see below), whose sum is σ = 64873224. Its totient is φ = 18841600.

The previous prime is 40442209. The next prime is 40442243. The reversal of 40442218 is 81224404.

It can be written as a sum of positive squares in 4 ways, for example, as 39526369 + 915849 = 6287^2 + 957^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40442192 and 40442201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2455 + ... + 9322.

Almost surely, 2^40442218 is an apocalyptic number.

40442218 is a deficient number, since it is larger than the sum of its proper divisors (24431006).

40442218 is a wasteful number, since it uses less digits than its factorization.

40442218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11897.

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 40442218 is about 6359.4196276075. The cubic root of 40442218 is about 343.2508768166.

The spelling of 40442218 in words is "forty million, four hundred forty-two thousand, two hundred eighteen".