40006240 has 48 divisors (see below), whose sum is σ = 96087600. Its totient is φ = 15736320.

The previous prime is 40006199. The next prime is 40006247. The reversal of 40006240 is 4260004.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40006247) 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, 7711 + ... + 11809.

It is an arithmetic number, because the mean of its divisors is an integer number (2001825).

Almost surely, 2^40006240 is an apocalyptic number.

40006240 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 40006240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48043800).

40006240 is an abundant number, since it is smaller than the sum of its proper divisors (56081360).

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

40006240 is a wasteful number, since it uses less digits than its factorization.

40006240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175 (or 4167 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40006240 is about 6325.0486164139. The cubic root of 40006240 is about 342.0129721605.

Adding to 40006240 its reverse (4260004), we get a palindrome (44266244).

The spelling of 40006240 in words is "forty million, six thousand, two hundred forty".