40012440 has 96 divisors (see below), whose sum is σ = 130047120. Its totient is φ = 9844224.

The previous prime is 40012417. The next prime is 40012447. The reversal of 40012440 is 4421004.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40012447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19294 + ... + 21266.

Almost surely, 2^40012440 is an apocalyptic number.

40012440 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 40012440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65023560).

40012440 is an abundant number, since it is smaller than the sum of its proper divisors (90034680).

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

40012440 is a wasteful number, since it uses less digits than its factorization.

40012440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013 (or 1996 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 40012440 is about 6325.5387122363. The cubic root of 40012440 is about 342.0306391619.

Adding to 40012440 its reverse (4421004), we get a palindrome (44433444).

It can be divided in two parts, 4001 and 2440, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 40012440 in words is "forty million, twelve thousand, four hundred forty".