440040636 has 36 divisors (see below), whose sum is σ = 1271229232. Its totient is φ = 125725824.

The previous prime is 440040619. The next prime is 440040647. The reversal of 440040636 is 636040044.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×440040636² = 387271522662568992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 872845 + ... + 873348.

Almost surely, 2^440040636 is an apocalyptic number.

It is an amenable number.

440040636 is an abundant number, since it is smaller than the sum of its proper divisors (831188596).

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

440040636 is a wasteful number, since it uses less digits than its factorization.

440040636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746210 (or 1746205 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 440040636 is about 20977.1455636843. The cubic root of 440040636 is about 760.6139060946.

The spelling of 440040636 in words is "four hundred forty million, forty thousand, six hundred thirty-six".