40081240 has 32 divisors (see below), whose sum is σ = 95489280. Its totient is φ = 15089152.

The previous prime is 40081229. The next prime is 40081247. The reversal of 40081240 is 4218004.

40081240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40081247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28792 + ... + 30151.

It is an arithmetic number, because the mean of its divisors is an integer number (2984040).

Almost surely, 2^40081240 is an apocalyptic number.

40081240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40081240 is an abundant number, since it is smaller than the sum of its proper divisors (55408040).

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

40081240 is a wasteful number, since it uses less digits than its factorization.

40081240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58971 (or 58967 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 40081240 is about 6330.9746485040. The cubic root of 40081240 is about 342.2265635088.

Adding to 40081240 its reverse (4218004), we get a palindrome (44299244).

The spelling of 40081240 in words is "forty million, eighty-one thousand, two hundred forty".