40440418 has 8 divisors (see below), whose sum is σ = 60805980. Its totient is φ = 20171760.

The previous prime is 40440403. The next prime is 40440419. The reversal of 40440418 is 81404404.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 35319249 + 5121169 = 5943^2 + 2263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 40440392 and 40440401.

It is not an unprimeable number, because it can be changed into a prime (40440419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23173 + ... + 24856.

Almost surely, 2^40440418 is an apocalyptic number.

40440418 is a deficient number, since it is larger than the sum of its proper divisors (20365562).

40440418 is a wasteful number, since it uses less digits than its factorization.

40440418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48452.

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

The square root of 40440418 is about 6359.2781036844. The cubic root of 40440418 is about 343.2457842774.

The spelling of 40440418 in words is "forty million, four hundred forty thousand, four hundred eighteen".