40004240 has 40 divisors (see below), whose sum is σ = 94333248. Its totient is φ = 15774080.

The previous prime is 40004231. The next prime is 40004243. The reversal of 40004240 is 4240004.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40004243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2159 + ... + 9201.

Almost surely, 2^40004240 is an apocalyptic number.

40004240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40004240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47166624).

40004240 is an abundant number, since it is smaller than the sum of its proper divisors (54329008).

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

40004240 is a wasteful number, since it uses less digits than its factorization.

40004240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7127 (or 7121 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 40004240 is about 6324.8905128864. The cubic root of 40004240 is about 342.0072727384.

Adding to 40004240 its reverse (4240004), we get a palindrome (44244244).

The spelling of 40004240 in words is "forty million, four thousand, two hundred forty".