40440040 has 16 divisors (see below), whose sum is σ = 90990180. Its totient is φ = 16176000.

The previous prime is 40440019. The next prime is 40440077. The reversal of 40440040 is 4004404.

It can be written as a sum of positive squares in 2 ways, for example, as 40424164 + 15876 = 6358^2 + 126^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40439996 and 40440023.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505461 + ... + 505540.

Almost surely, 2^40440040 is an apocalyptic number.

40440040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40440040 is an abundant number, since it is smaller than the sum of its proper divisors (50550140).

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

40440040 is a wasteful number, since it uses less digits than its factorization.

40440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011012 (or 1011008 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 40440040 is about 6359.2483832604. The cubic root of 40440040 is about 343.2447148250.

Adding to 40440040 its reverse (4004404), we get a palindrome (44444444).

The spelling of 40440040 in words is "forty million, four hundred forty thousand, forty".