40042240 has 144 divisors (see below), whose sum is σ = 113319360. Its totient is φ = 13271040.

The previous prime is 40042231. The next prime is 40042273. The reversal of 40042240 is 4224004.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 367306 + ... + 367414.

It is an arithmetic number, because the mean of its divisors is an integer number (786940).

Almost surely, 2^40042240 is an apocalyptic number.

40042240 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 40042240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56659680).

40042240 is an abundant number, since it is smaller than the sum of its proper divisors (73277120).

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

40042240 is a wasteful number, since it uses less digits than its factorization.

40042240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 164 counting only the distinct ones).

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

The square root of 40042240 is about 6327.8938044187. The cubic root of 40042240 is about 342.1155292923.

Adding to 40042240 its reverse (4224004), we get a palindrome (44266244).

The spelling of 40042240 in words is "forty million, forty-two thousand, two hundred forty".